U.S. Army UH-60M Black Hawk helicopter pilots and crew chiefs, assigned to 16th Combat Aviation Brigade, 7th Infantry Division, prepare for a nighttime training operation at Gray Army Airfield on Joint Base Lewis-McChord, Wash., May 25, 2016. Trainin...

U.S. Army AH-64E Apache helicopter pilots, assigned to 16th Combat Aviation Brigade, 7th Infantry Division, fly into darkness at Joint Base Lewis-McChord, Wash., May 25, 2016. Training in the dark prepares aviators for the challenges they might face ...

U.S. Army AH-64E Apache helicopter pilots, assigned to 16th Combat Aviation Brigade, 7th Infantry Division, fly overhead as the last light of the sun fades over Joint Base Lewis-McChord, Wash., May 25, 2016. Training in the dark prepares aviators for...

U.S. Army UH-60M Black Hawk helicopter pilots and crew chiefs, assigned to 16th Combat Aviation Brigade, 7th Infantry Division, prepare for a nighttime training operation at Gray Army Airfield on Joint Base Lewis-McChord, Wash., May 25, 2016. Trainin...

U.S. Army UH-60M Black Hawk helicopter pilots and crew chiefs, assigned to 16th Combat Aviation Brigade, 7th Infantry Division, prepare for a nighttime training operation at Gray Army Airfield on Joint Base Lewis-McChord, Wash., May 25, 2016. Trainin...

U.S. Army UH-60M Black Hawk helicopter pilots and crew chiefs, assigned to 16th Combat Aviation Brigade, 7th Infantry Division, prepare for a nighttime training operation at Gray Army Airfield on Joint Base Lewis-McChord, Wash., May 25, 2016. Trainin...

U.S. Army UH-60M Black Hawk and AH-64E Apache helicopter pilots and crew chiefs, assigned to 16th Combat Aviation Brigade, 7th Infantry Division, prepare for a nighttime training operation at Gray Army Airfield on Joint Base Lewis-McChord, Wash., May 25, 2016. Training in the dark prepares aviators for the challenges they might face on real-world missions.