Aircraft maintenance was either done on the parking aprons or in the only maintenance hanger we had at the time. Replacement of damaged or non-operating equipment followed the “black box” rule. Major electronic components were designed as plug-in black boxes. If a component was not working, it was pulled and replaced with another box. The pulled unit then was put on a test bench for repair. The scuttlebutt was that sometimes the first test was a hardy smack with an open hand. If the unit then tested OK, it was put back on the parts rack for future duty. Believe it or not. The closest I ever got to being hit by flying shrapnel was one afternoon, standing in front of the maintenance hanger. A Vietnamese pilot in training was taxiing his helicopter down the parking apron when he apparently lost control and plowed into a couple of parked helicopters. Everybody in the area hit the deck as pieces or rotor blades and fuselages went flying in all directions. Needless to say, we had some pissed-off Marine instructors and brass. 
UH-34 helicopters (we called them HUS) lined up on the Danang flight line included HMM-364, the Marine helicopter squadron known as the Purple Foxes. They replaced HMM-361, the Flying Tigers. In July of 1964, they  were replaced by the Golden Eagles, HMM-162.
Helicopter maintenance crews and avionics per-sonnel were in a constant work mode; making sure we had as many operational aircraft available as possible at all times. It was not an easy job in the heat and humidity of Danang.
Vietnamese Air Force helicopters, farther down the line, were used for operational missions and training.
Army UH-1 helicopter, or Huey, also was serviced at Danang. The Hueys had the firepower lacking in the Marine UH-34 and often flew fire suppression support for the Marine helicopters transporting ARVN troops into the field. 
Rubber fuel farm was being setup by Marine combat engineers for the storage of aviation fuel. The huge rubber bladders were laid above ground and surrounded with earthen berms to help contain leaks and prevent fires from spreading. 
South Vietnamese troops waiting to be transported into the jungle for another combat mission.
C-123 aircraft, used to transport every imaginable kind of cargo, from rice to pigs. Tropical weather characteristics of high temperature and high humidity caused lift problems for both fixed-wing aircraft and our helicopters.
Hueys sported two machine guns and eight unguided rockets on each side.
Three takeoff attempts were made by a C-123 pilot on a particularly hot and humid afternoon. We nervously watched as the plane finally lumbered into the air, using the full length of the runway and barely clearing a distant treeline.  We commented on how we were happy not being on that flight.
Fueling aircraft and other equipment initially was done from 55 gallon drums using hand pumps.
US Army advisors were always on hand as tactical advisors and to bolster troop morale.
Recovery of men and equipment. Helicopters were beginning to be damaged or shot down more frequently. We tried to recover any downed aircraft, but if the situation proved too difficult for extraction, a team of combat engineers were rappelled into the crash site where they destroyed the helicopter with explosives.
Skuttlebutt had it that visiting brass would often be granted the privilege of leading a flight on a combat mission. These officers sometimes had limited experience and wanted the air time to get their combat ribbons. On this occasion, the mission barely got off the ground before the commanding officer on this flight ditched his helicopter into the drink. 
Mechanics taking a break on the flight line.
ARVN troops waiting to board helicopters for their next combat mission.
Viet Cong prisoners. Or so we were told. The only enemy I ever saw in my six months at Danang. These prisoners (left and  right) were being held in a make-shift compound on the perimeter of the base. The ARVN guards were always happy to pose for a photo.
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Marsden matting, used to hastily construct parking ap-rons and taxi runways to facilitate the arrival of the first Marine helicopter squadron in 1963. Called PSP, or per-forated steel planking in Vietnam, the matting was used in World War II for the rapid construction of runways and landing strips.
SHUFLY United States Marine Corps Danang Airfield Operation
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The French left a small, primitive airfield at Danang. The runway was short, there was only one hanger, no revetment for aircraft, and no fueling facilities. A massive buildup and modernization program would transform this base into a major center for air operations throughout the pending war.