Since I was confirmed as Army Secretary in May 2016, I've tried to get out of the Pentagon and see America's Army through the eyes of Soldiers doing what they do, where they do it. I've engaged with teams of Soldiers in exercises with our NATO Allies in Poland. I've watched them conduct jungle warfare training in the Pacific, and participate in northern warfare training in Alaska. I've marveled at the ability of our Army -- from our youngest Soldiers to our most senior leaders -- to engage with partner militaries from Malaysia to Jordan, and to train and mentor national armies fighting for their future in Iraq and Afghanistan.I've even seen Army athletes compete for Olympic glory. They included Second Lieutenant Sam Kendricks, a son of Mississippi and a bronze medalist in the Pole Vault, who humbled us all as he paused in mid-competition to pay respect to our National Anthem. I watched as Specialist Paul Chelimo, a Kenyan-born Soldier who earned his citizenship through Army service, won the United States a silver medal in the Men's 5,000-meters in Rio de Janeiro.These are just a few of our Soldiers' remarkable accomplishments as they confront the diverse missions that America has entrusted to its Army -- missions that will grow more challenging in an increasingly complex world. Accomplishing these missions today and into the future requires our force to include the broadest possible spectrum of ideas, perspectives, and experiences. To fight and win the Nation's wars in an age of new and emerging threats, we need to draw from America's best, and enable them to harness the innate power of diverse teams. We need experience, critical thinking, and creativity in our force, but most importantly we need teams of people who think differently from one another and yet are joined together in common cause.Over thirty years of scientific and organizational research clearly demonstrates that cognitively diverse teams are better at solving complex problems when compared to more homogenous teams, even when the homogenous teams are composed of top performing, highly capable individuals. We know some of this instinctively: different approaches often reveal overlooked solutions. Solving a problem often requires learning from others how to see it differently.Researchers at Cal-Tech and the University of Michigan found that teams that include members of different ethnic or cultural backgrounds bring a mix of distinct cognitive approaches, which deliver better outcomes. Business schools teach similar lessons based on their own research on gender. Their findings demonstrate that stronger more effective firms include greater numbers of women at top levels of management. Other studies have documented how teams of individuals drawn from diverse economic backgrounds, academic disciplines, and political affiliations are better problem solvers and drivers of innovation.Within the Army itself, civilian contributions have been particularly pronounced in this area. Diverse teams enabled our scientists to develop the lithium battery, night vision, and most recently, work towards a vaccine for the Zika virus. Today, within organizations like DARPA, civilians and Soldiers partner to keep our Army at the cutting edge of developments in robotics and material science. As an Army, we need to do more to recognize the remarkable value that civilians bring to our Total Force, which comes in part from the different perspectives they bring to our problem sets.Within diverse teams, problem solving is additive; it is not simply that one member proposes a novel solution. Rather, each new solution influences and can be built upon by their fellow team members, generating a virtuous cycle of beneficial outcomes. No single member of the team could generate the ongoing series of improvements to that solution. It is this combination of teamwork, ability, and diversity that produces the greatest benefit.Scientists have long taken advantage of this dynamic, adopting interdisciplinary approaches and incorporating insights from different fields to help solve otherwise intractable problems. This approach to innovation led to the discovery of the double helix, the invention of the microwave, and other breakthroughs.So the verdict is in. For the Army of tomorrow to be as strong as the Army of today, we must harness the power of diverse teams and draw further from one of America's greatest advantages -- our diverse population. It's a lesson our Army has lived many times across its history. But our success is never static. We must challenge ourselves to harness these benefits and make our force more effective. Our Army must draw from a broader range of our Nation's communities and expand the pool of eligible and willing candidates for service and leadership, enabling the Army the greatest opportunity to recruit and retain America's best.Efforts to engender a broader spectrum of ideas and perspectives within our Army team are also complemented by DoD-wide Force of the Future initiatives. At the heart of Force of the Future is a push to break down walls between our military and one of our nation's greatest sources of strength, our innovative industrial base. By providing more opportunities for skilled experts in areas such as cyberspace operations and electronic warfare to contribute to our team, and by allowing more of our Soldiers to gain insights and experience from working in the private sector, we will make the Army a more effective force for the future.Few other nations have so many diverse communities and perspectives woven into their social fabric or history. But, engendering greater diversity is not simply a matter of tapping into larger numbers of communities. It also requires us to attract greater numbers of future Soldiers from different regions of our country such as the Pacific Northwest, West Coast, Southwest, and Northeast, which contain many of the healthiest and fittest cities in America, as well as increasingly diverse populations that mirror America's changing demographics.A crucial benefit of a more diverse Army is also that it allows us to narrow the civil-military divide at home. Today, too many of America's communities are unfamiliar with their Army, even though they include men and women whose skills and abilities would make our Army team stronger. We must ensure that when Americans from across our society look at their Army, they see an organization they can relate to, recognize, and trust. We must also ensure that when America's best and brightest look at their Army, they see an organization where they feel they can contribute and excel.Finally, a more diverse Army provides the United States with a competitive advantage in expanding our ability to interact and engage the citizens of the complex world in which we will continue to operate. This is absolutely critical, because no other arm of our government has such a large presence around the globe as the U.S. Army. By way of comparison, while the rest of the United States government has approximately 15,000 Foreign Service officers at work around the world representing our Nation's interests, America's Army has up to ten times that number of Soldiers at work overseas every day.Today's Army is unique in history in that we have at least a few Soldiers in our ranks from virtually every one of those countries and cultures in which we currently operate. How much more effective could we be at partnership and cooperation if those few became many? In addition to the benefits diverse teams create in strengthening partnerships, nearly two decades of conflict have taught us hard truths about how appreciation of diverse populations helps equip us in understanding and defeating our adversaries. When our Army is tasked not only to take and hold terrain, but also to bring disparate partners together -- many of whom have difficult ethnic and sectarian histories -- the diversity of our teams is also a force multiplier. Partners across the world like to work with American Soldiers and when they do, they cannot ignore the diversity of Soldiers or the standard of excellence they set in working together. Our Army draws strength from both the example of our power and the power of our example.For the Army to measure up to the demands of a rapidly changing world, we must also draw upon the Army ethos of critical thinking and self-examination. It may be under-appreciated outside the national security community, but no organization, public or private, matches the Army for its culture of relentless self-review, one that is borne from the experience of ground combat where mistakes are measured in lives.We need to draw upon this tradition to challenge our own notions of diversity and examine our unconscious biases. We often pride ourselves in embodying the word "meritocracy" -- that we are an institution in which any individual can succeed, or fail, on his or her own merits regardless of race, color, national origin, religion, sex, or sexual orientation. The many instances where we have approached this ideal are part of our Army's great strength, but honoring these ideals means that we cannot afford to ignore the times where we've failed to live up to them. Striving to engender greater diversity in our force is too important to the Army's effectiveness to avoid continuous self-examination.These efforts will not be easy, nor will success be automatic. Indeed, some of the same scientific studies that show the benefits of diverse teams also reveal that diverse groups can be less efficient in the short term. In fact, scientists have found that the very friction inherent in bringing together a group of individuals with different worldviews is what causes them to work harder, think more deliberately, and learn how to communicate more effectively. Often, what is comfortable is not what is most creative, or what delivers the greatest effect on the battlefield. It's a concept familiar to all of us: "no pain, no gain."Whether during the Second World War or in the days that followed September 11th, it is when Americans have come together in times of difficulty that our nation has demonstrated its greatest strength. And at so many times in our history, the Army has led the way.Engendering greater diversity and inclusivity is not social experimentation; it is in fact a dynamic that has often been at the center of the Army's success. It's a story that dates back to the earliest days of our Republic, when marginalized Scots-Irish frontiersmen teamed up with Tidewater aristocrats and New Englander merchants to win our independence. It's a tradition carried forward by waves of immigrants who came to our shores and forged their American identity through military service. It's a legacy found in the service of the famed Buffalo Soldiers, African-American troops who helped tame the American West. Many of them were former slaves like Lieutenant Henry Flipper, the first African-American to graduate from the U.S. Military Academy. It's a history that include Soldiers like Distinguished Service Cross-awardee, Private Marcelino Serna, a Mexican-American who was the most highly decorated Soldier from Texas in World War I.These examples are each part of our larger Army story. When critics said the Army was too set in its ways, too big, or too afraid to move forward with change, our men and women in uniform proved them wrong; desegregating after World War II, 16 years before the Civil Rights Act, integrating women into our military where they would earn equal pay as their male counterparts four decades ago, at a time before they were welcome in much of our workforce. As the Army answered challenges and delivered solutions at difficult times in our history, our Soldiers have proven what's right about our country.I'm reminded of our continuing journey every time I look at a framed fragment of the 54th Massachusetts Infantry Regiment Colors, the Army's first African American regiment of the Civil War, which I proudly display in my office. On July 18, 1863, Sergeant William H. Carney retrieved this flag from a fallen color bearer and carried it forward despite multiple wounds. He survived to return the flag to his own lines. "I only did my duty," he said. "The old flag never touched the ground."Sergeant Carney would eventually be awarded the Medal of Honor for his acts of courage and valor, albeit decades after when later generations could see through his color to recognize his valor. In fact, the Army would wait another half-century until President Truman integrated the Armed Forces, declaring that it was "essential that there be maintained in the armed services of the United States the highest standards of democracy." To do justice to Sergeant Carney's dedicated service and the sacrifice of countless other Americans, we have responsibilities to meet today. We must continue on our journey, building stronger and more diverse teams that will make our Army a more effective force in the future.As the 22nd Secretary of the United States Army, I am committed to a future Army where every rank and specialty can draw from among America's best, where our Soldiers represent states and cities across this country, and members of its diverse communities. I see a force where our Soldiers are enabled by another great source for our nation's strength: our marketplace of ideas and innovation, where our Soldiers are supported by an acquisitions process that more closely reflects the adaptability of America's industrial base, equipping our men and women with what they need, when they need it. I see a force in which Soldiers of various religious backgrounds are provided appropriate accommodations and have the liberty to follow their faith traditions as members of our military family. I see an Army where we care for our Soldiers physical and mental health, as well as that of their family members, with the same determination we bring to warfighting, giving our men and women the peace of mind they need to focus on their missions as they confront emerging threats and defend our nation around the world.For the Army of tomorrow to remain as great as the Army of today, we must live up to our own legacy, continually challenging ourselves to attract the best, and to bring out the best in each other as members of strong, diverse, and creative teams. Just as Sergeant Carney of the 54th Massachusetts picked up the Colors from those who went before him, we must carry the banner forward today to become an Army that is stronger, more adaptable, and more effective in achieving our missions and meeting our responsibilities to the American people.