Members of the 3rd Security Police Squadron and the Army's 25th Infantry Division (Light) fill sand bags near an M1038 High-Mobility Multipurpose Wheeled Vehicle (HMMWV) as they prepare a position near a fuel depot. U.S. Army troops that were in the Philippines for an exercise have been called upon to augment base security forces as the Filipino government fights to put down a coup attempt by rebel factions within the nation's armed forces