Hi Offer,
Like with the gunshields--that were never adopted, too bad we had to wait until 1974 to learn --and davka from the Egyptians-- what we could have already learned from the folks that supplied us with the vehicles from their own experience in the 1960s.
(and if I recall correctly, from the experience of the Germans and Russians tankers who used this trick already in WW2)
ARMORED CAVALRY ASSAULT VEHICLES WITH RPG SCREENS ON FRONT
The armored vehicles themselves provided protection against the enemy's small arms and automatic weapons, but the men added a new device to protect the vehicles against the armor-piercing B40 rocket-propelled grenade (RPG). It was called the RPG screen. Nothing more than a section of "cyclone" fence, it caused a shaped charge warhead to detonate before it hit the vehicle. Each crew set up a section of fence in front of its position, and the command element in the center established a second screen around its vehicles. This simple expedient saved many vehicles and bunker positions.
Fighting positions were built between each cavalry vehicle, and some of the M60 machine guns on the armored cavalry assault vehicles were dismounted and positioned to provide grazing fire. Each vehicle carried three or four rolls of concertina barbed wire. The wire was strung as an outer barrier. Finally, four or five claymore mines were set up in front of each armored vehicle. Listening posts were sent out, and Team C waited for the enemy.
The rocket-propelled grenade screen was one of the most widely used innovations of the war. Cyclone fence could be found at virtually every U.S. installation in Vietnam. The concept of detonating enemy rocket-propelled grenades before they hit the target was sound, and the adaptation of existing materiel for this use was ingenious.