1. No ground units of any kind within 500 m of any hostile base. (Camping* Prevention)
IE: If the missiles are close enough nothing you can do will prevent them from hitting you. This should give them a little more time to react.
2. All armed choppers and AA Vehicles must leave the safe zone and lose invulnerability before they may go and rearm. (Pump & Dump and AA abuse prevention)
3. No camping* in or above your retracted safe zone. If you're not fighting from your safe zone then you won't be getting fired upon while inside you're safe zone. (Secondary/ Reverse Camping Prevention)
*Camping Definition - Occupying a single area on the map for an extended period of time to gain a tactical advantage in an unsportsmanlike like way with intent to engage hostile players. (The objective of KotH is camping, but you're supposed to be doing it in the AO not the edge of the enemy base.)