U.S. Marines with Company A, Battalion Landing Team 1st Battalion, 4th Marines, 31st Marine Expeditionary Unit, provide suppressing fire on targets with an M240B machine gun during a Combined Arms Live Fire Exercise here, Feb. 15. CALFEX was conducted during Exercise Cobra Gold 2012 and included units from the 31st MEU, U.S. Army, Royal Thai Army and the Royal Thai Marine Corps. CG 2012 demonstrates the resolve of the U.S. and participating nations to increase interoperability and promote security and peace throughout the Asia-Pacific region. The 31st MEU is the U.S.’s expeditionary force in readiness in the Asia-Pacific region. - U.S. Marines with Company A, Battalion Landing Team 1st Battalion, 4th Marines, 31st Marine Expeditionary Unit, provide suppressing fire on targets with an M240B machine gun during a Combined Arms Live Fire Exercise here, Feb. 15. CALFEX was conducted during Exercise Cobra Gold 2012 and included units from the 31st MEU, U.S. Army, Royal Thai Army and the Royal Thai Marine Corps. CG 2012 demonstrates the resolve of the U.S. and participating nations to increase interoperability and promote security and peace throughout the Asia-Pacific region. The 31st MEU is the U.S.’s expeditionary force in readiness in the Asia-Pacific region.