English: This is an aerial photo of Fire Support Base Danger, headquarters of the 4/39 "Hardcore" Infantry Battalion, 1st Brigade, 9th Infantry Division, United States Army, in Dinh Tuong Province, Republic of Vietnam, during "Operation Speedy Express" in March 1969. I located this work -- attributed to the U.S. Army -- on someone's personal web site with the following description: "In March 1969 the [Ninth Infantry] Division erected their final fire support base to be constructed in Vietnam. It was the westernmost installation in Dinh Tuong Province and housed the battalion HQ of the 4/39 Infantry, Company B, and a battery of six, 105mm, towed howitzers from the 1/11 Artillery. The base was ideally situated between the Rach Ba Lam and the Rach Chanh in a wide expanse of inundated rice paddies with clear fields of fire on all perimeters. The helicopter pads were outside the fortifications. - US Army photo"