But they don't do it. Air support is next to non-existent in any army and orbital support IS non-existent. They don't use it on the Last City, they don't use it on each other when they're clearly at war with one another, and they don't use it on us when we're in the field. It's all almost exclusively infantry combat with the occasional drop ship that appears for a few seconds to drop guys off, sporadic tank appearances, and light vehicles that appear once in a blue moon. Modern day ground forces could easily contend with we've been shown and could complete any of the strike missions. Also, modern day soldiers wouldn't release the archon priest to kill him, we'd just strap a shit ton of C4 to his prison box and blow his ass up inside.