Soldiers from the U.S. and Philippine Army participate in a live-fire exercise in Tarlac Province, the Philippines, on Sept. 21, 2013. U.S. and Filipino forces commenced on Sept. 18 the RP-U.S. Amphibious Landing Exercise (PHIBLEX) which will last until Oct. 11 and involves 2,300 Filipino and U.S. soldiers. (Xinhua/Rouelle Umali)

U.S. and Filipino soldiers fire a 105mm Howitzer as they participate in a live-fire exercise in Tarlac Province, the Philippines, on Sept. 21, 2013. U.S. and Filipino forces commenced on Sept. 18 the RP-U.S. Amphibious Landing Exercise (PHIBLEX) which will last until Oct. 11 and involves 2,300 Filipino and U.S. soldiers. (Xinhua/Rouelle Umali)

An AH-1Z Viper attack helicopter participates in a live-fire exercise in Tarlac Province, the Philippines, on Sept. 21, 2013. U.S. and Filipino forces commenced on Sept. 18 the RP-U.S. Amphibious Landing Exercise (PHIBLEX) which will last until Oct. 11 and involves 2,300 Filipino and U.S. soldiers. (Xinhua/Rouelle Umali)

Soldiers from the U.S. and Filipino Marines participate in a live-fire exercise in Tarlac Province, the Philippines, on Sept. 21, 2013. U.S. and Filipino forces commenced on Sept. 18 the RP-U.S. Amphibious Landing Exercise (PHIBLEX) which will last until Oct. 11 and involves 2,300 Filipino and U.S. soldiers. (Xinhua/Rouelle Umali)

A soldier from the U.S. Marines participates in a live-fire exercise in Tarlac Province, the Philippines, on Sept. 21, 2013. U.S. and Filipino forces commenced on Sept. 18 the RP-U.S. Amphibious Landing Exercise (PHIBLEX) which will last until Oct. 11 and involves 2,300 Filipino and U.S. soldiers. (Xinhua/Rouelle Umali)