Everyone is familiar with 'respawn' rules. Airsofters have been using them for a long time.
At Old Fort, the 5-knot rule has been used with some degree of success.
At Highpoint, the reinforcements come every 15 minutes, or sooner depending on the number of players involved in the game.
If the 2 rule types were combined, and players are made to 'carry' wounded to the reinforcement point (instead of players walking there willy-nilly through firefights), we'd have a more realistic reinforcement rule. Carrying the wounded consists of having one hand on the wounded and taking him to the LZ. The wounded should untie one knot for every 5 minutes he goes untreated.
Also, we should be enforcing the 4 man or more at a time reinforcement rule. If the 15 minutes passes and there are not enough men for a reinforcement, then you don't get them. The CO should be able to call the 'airbase' every 15 minutes and ask if there any reinforcements and detail them to go where they are most needed. Someone at the LZ would then advise the CO of the situation. The "respawn point" now becomes the LZ, both for outgoing casualties and incoming reinforcements.
Finally, instead of being chosen before the game, LZs should be designated by the CO for each side depending on terrain. That means an LZ could be overrun. Anyone there would have to move to the start point where their team began the game.
Recap:
Designatable LIVE LZs
4 man+ reinforcement every 15 min (or as chosen before the game)
You must have enough men to reinforce or wait until they exist
Carry wounded to the LZ
Receive reinforcements at LZ as well
Opinions? Gripes?