Some Land Units with Jump Jets

They only have enough energy to a) fire guns or b) use jump-jets. Give the guns an 8 second cooldown after the jets turn off.

Fluff arguments are tedious.

8 seconds is an absurdly long time to be getting killed.

Jump jets help to minimize the mobility gap between land and air, and adds another unique trait for some land units to excel over others. It helps with breaching enemy defenses by letting heavier units attack from an unusual angle. That's all good.