I took this excerpt from a thread in the Battlferont forum:
"Any unit on foot can administer Buddy Aid to any friendly casualty on the ground or in a building (even if not from the same squad). In order to perform Buddy Aid, the unit simply has to be in the same action square as the casualty. The player does not issue an order to initiate Buddy Aid - it simply happens. When a unit administers Buddy Aid, it *may* pick up some ammo from the casualty, and it might also swap its own weapon for the casualty's weapon, especially if the casualty's weapon is "better" (it's especially likely that squad automatic weapons like BARs, Brens, and MG42s will be picked up this way). There is no player control over what is picked up via Buddy Aid -- the player does not use the "Acquire" command or anything like this. The game's soldier AI routines decide what is or is not taken from the casualty."
I huge scenario I am playtesting right now I had to get Shrecks or Fausts from fallen comrades all the time and it worked well....