Nathaniel T. Rodriguez asks U.S. air operation Marines questions about their air traffic control equipment on Antonio Bautista Air Base on Puerto Princesa April 17, 2012. The career counterparts are jointly conducting air traffic control for the duration of Balikatan 2012 (BK12) Task Force Palawan. BK12 is a bilateral, joint exercise conducted annually between the U.S. and the Republic of the Philippines. This year marks the 28th iteration of the nations' exercise. - Nathaniel T. Rodriguez asks U.S. air operation Marines questions about their air traffic control equipment on Antonio Bautista Air Base on Puerto Princesa April 17, 2012. The career counterparts are jointly conducting air traffic control for the duration of Balikatan 2012 (BK12) Task Force Palawan. BK12 is a bilateral, joint exercise conducted annually between the U.S. and the Republic of the Philippines. This year marks the 28th iteration of the nations' exercise.