If you attempt to use a trainer on a ranked community server, anti-cheat software (like PunkBuster or EvenBalance) will ban you immediately. This article strictly covers offline, single-player , and local LAN co-op against AI.
Tanks, jets, and helicopters can be damaged. A trainer can set vehicle health to a static 100% or instantly repair any smoking engine. "No Overheat" prevents the jet cannon from jamming during dogfights.