NO NONNONONOONO. Vet whoreing is a problem already. I dont want to make it harder to lose vet. We dont need hordes of vet tanks. Vet is meant to die, not baby. If you want to baby your vet then go ahead and lose games. No need to reward playing like a pussy.
Indeed, remove retreat entirely and make it so that players have to move infantry back to their spawn to retreat it.
This would make the game much less vet whoring. If they move to slow for you, get a Halftrack to use as an ambulance.