Japanese Col. Matsushi Kunii, left center, commanding officer, Western Army Infantry Regiment, discusses the capabilities of the High-Explosive Rocket-Assisted Projectile with U.S. Marine Lt. Col. John O'Neal, commanding officer, 15th Marine Expeditionary Unit, and Lt. Col. Brian Russell, commanding officer, 1st Air Naval Gunfire Liaison Company, during Exercise Iron Fist 2014 aboard Twentynine Palms, Calif., Jan. 28, 2014. Iron Fist 2014 is an amphibious exercise that brings together Marines and Sailors from the 15th MEU, other I Marine Expeditionary Force units, and soldiers from the Japan Ground Self-Defense Force, to promote military interoperability and hone individual and small-unit skills through challenging, complex and realistic training. (U.S. Marine Corps photo by Sgt. Jamean R. Berry/Released)