stumbled over a really interesting collection of pictures from the Vietnam war, organized and categorized in galleries, most of them commented:
http://www.vietnamgear.com/gallery.aspxSome that caught my attention more than the others:
A Self Defense Corps irregular demonstrates the fire direction arrow at outpost Ly Van Manh.
Pointed in the direction of attacking forces, the arrow enabled pilots to quickly ascertain the direction of the enemy assault. In the event of a night attack, flaming cans were used to illuminate the arrow.
Photo taken: 14 January 1963

A member of the 101st Airborne on Operation Van Buren sets fire to a village hut containing Viet Cong rice stocks.
Photo taken: January 1966

A Member of Company. L (Ranger), 75th Infantry, disembarks from a UH-1D helicopter during Operation Bushmaster.
Wearing an ERDL camouflage tropical combat uniform, the Ranger is armed with a CAR-15 (XM-177) rifle and uses 1-quart canteen covers to carry the magazines. He also wears a STABO harness.
Photo taken: August 1971

A member of the 101st Airborne questions a Viet Cong suspect during operation Van Buren. The soldier has turned his Tropical Combat Jacket inside out to hide its full color insignia.
Though the Tropical Combat Uniform Board recommended the introduction of subdued insignia (black on olive drab) in November 1965, many US personnel were still wearing color insignia in late 1966.
Photo taken: February 1966

Madame Ho Thi Que, The Tiger Lady, courageously served in combat with the South Vietnamese 44th Ranger Battalion in the early 1960's.

Much more there, here a list of categories:
Soldiers
Special Forces
SOG
SEALs
Australians
Korean Forces
Mobile Riverine Force
River Patrol Force
Coastal Surveillance Force
Aircraft
Vehicles
Dogs
Places
Visitors
Rattler