
U.S. Marines are seen after a live fire exercise as part of the Philipines-U.S. Balikatan 2019 in Tarlac Province, the Philippines, April 10, 2019. The Philippines and the United States began on April 1 their biggest annual joint military exercise known as Balikatan, or Shoulder-to-Shoulder. Exercise spokesman for the Philippines Lt. Cmdr. Liez Vidallon has said there are around 7,500 participating troops, consisting of some 4,000 Philippine troops and 3,500 U.S. troops, in this year's drills. (Photo:Xinhua)

An A-10 Thunderbolt aircraft of the U.S. Marines participates in a live fire exercise as part of the Philipines-U.S. Balikatan 2019 in Tarlac Province, the Philippines, April 10, 2019. The Philippines and the United States began on April 1 their biggest annual joint military exercise known as Balikatan, or Shoulder-to-Shoulder. Exercise spokesman for the Philippines Lt. Cmdr. Liez Vidallon has said there are around 7,500 participating troops, consisting of some 4,000 Philippine troops and 3,500 U.S. troops, in this year's drills. (Photo:Xinhua)

U.S. Marines are seen after a live fire exercise as part of the Philipines-U.S. Balikatan 2019 in Tarlac Province, the Philippines, April 10, 2019. The Philippines and the United States began on April 1 their biggest annual joint military exercise known as Balikatan, or Shoulder-to-Shoulder. Exercise spokesman for the Philippines Lt. Cmdr. Liez Vidallon has said there are around 7,500 participating troops, consisting of some 4,000 Philippine troops and 3,500 U.S. troops, in this year's drills. (Photo:Xinhua)

An A-10 Thunderbolt aircraft of the U.S. Marines participate in a live fire exercise as part of the Philipines-U.S. Balikatan 2019 in Tarlac Province, the Philippines, April 10, 2019. The Philippines and the United States began on April 1 their biggest annual joint military exercise known as Balikatan, or Shoulder-to-Shoulder. Exercise spokesman for the Philippines Lt. Cmdr. Liez Vidallon has said there are around 7,500 participating troops, consisting of some 4,000 Philippine troops and 3,500 U.S. troops, in this year's drills. (Photo:Xinhua)

Fighter jets of the Philippine Air Force participate in a live fire exercise as part of the Philipines-U.S. Balikatan 2019 in Tarlac Province, the Philippines, April 10, 2019. The Philippines and the United States began on April 1 their biggest annual joint military exercise known as Balikatan, or Shoulder-to-Shoulder. Exercise spokesman for the Philippines Lt. Cmdr. Liez Vidallon has said there are around 7,500 participating troops, consisting of some 4,000 Philippine troops and 3,500 U.S. troops, in this year's drills. (Photo:Xinhua)

A military helicopter of the Philippine Air Force participates in a live fire exercise as part of the Philipines-U.S. Balikatan 2019 in Tarlac Province, the Philippines, April 10, 2019. The Philippines and the United States began on April 1 their biggest annual joint military exercise known as Balikatan, or Shoulder-to-Shoulder. Exercise spokesman for the Philippines Lt. Cmdr. Liez Vidallon has said there are around 7,500 participating troops, consisting of some 4,000 Philippine troops and 3,500 U.S. troops, in this year's drills. (Photo:Xinhua)