U.S. Army paratroops with the 82nd Airborne jump out of an Air Force C-130 for the Saturday Proficiency Jump Program at Pope Army Airfield at Fort Bragg, N.C., Jan. 16, 2016. (Kevin Kim/U.S. Army)

A 120mm mortar is fired Jan. 20, 2016, during mortar live-fire training at the International Peacekeeping Security Center near Yavoriv, Ukraine, as part of Fearless Guardian II. (Adriana Diaz-Brown/U.S. Army)

Active duty and Reserve Component Japan Ground Self-Defense Force servicemembers deploy a 155 mm howitzer, as senior leaders from the U.S. Army Reserve Engagement Team-Japan observe, during an exercise at Kuroishibaru training grounds near Camp Kenjun, Japan, Jan. 16, 2016. (John Carkeet/U.S. Army)

A U.S. Army paratrooper assigned to the 173rd Airborne Brigade prepares to land onto Juliet Drop Zone in Pordenone, Italy, Jan. 20, 2016, during an airborne operation from a U.S. Air Force 86th Air Wing C-130 Hercules aircraft. (Davide Dalla Massara/U.S. Army)

A CH-47 Chinook helicopter assigned to 2nd Stryker Brigade Combat Team, 2nd Infantry Division takes off at the National Training Center, Fort Irwin, Calif., Jan. 18, 2016. (Kyle Edwards/U.S. Army)

U.S. Army soldiers assigned to 4th Battalion, 23rd Infantry Regiment, 2nd Stryker Brigade Combat Team, 2nd Infantry Division communicate over the radio during a Non-combatant Evacuation Operation at the National Training Center, Fort Irwin, Calif., Jan. 18, 2016. (Kyle Edwards/U.S. Army)

Soldiers assigned to 2nd Armored Brigade Combat Team, 1st Infantry Division, fire a 155mm artillery round from an M109A6 Paladin during a live-fire exercise at Camp Buehring, Kuwait, Jan. 19, 2016. (Ed Alvarado/U.S. Army)