A phrase synonymous with "ENGAGE." Used to command those with potential energy to exert their energies, i.e. going to maximum afterburners, opening fire, going to 7K rpm.
A succinct phrase which is akin to saying "give it everything you've got"
Sgt. Mckinzie: "There's a Pave Low and an Apache overhead, Captain."
Cpt. Freeman: "LIGHT 'EM UP"
"It's the nineties, and there is time to light 'em up"