1st Sgt. Maria Levitre, San German, Puerto Rico, native and senior noncommissioned officer of Headquarters and Headquarters "Hammer" Company, 1st "Ironhorse" Brigade Combat Team, 1st Cavalry Division, checks the seal on her protective gas mask during...

1st Sgt. Maria Levitre (right), San German, Puerto Rico, native and senior noncommissioned officer of Headquarters and Headquarters "Hammer" Company, 1st "Ironhorse" Brigade Combat Team, 1st Cavalry Division, supervises Hammer Soldiers as they don ch...

Capt. Timothy Martin (right), Midland, Mich., native and commander of Headquarters and Headquarters "Hammer" Company, 1st "Ironhorse" Brigade Combat Team, 1st Cavalry Division, demonstrates how to properly don chemical, biological, radiological and n...

Pvts. Ryan Knight (left), and Dallas Price-Holmes, both fire support specialists assigned to Headquarters and Headquarters "Hammer" Company, 1st "Ironhorse" Brigade Combat Team, 1st Cavalry Division, don chemical, biological, radiological and nuclear...