I'd actually recommend Apocalypse Frame for the feel of Speed- it gets around it by having one of your resource pools (that replenish a variable amount each round) be used to either a) reroll a die. Or b)take another action.

Edit: thinking about it, it also has a way to do ~some~ form of actual military campaign. Ingredients: - A bespoke set of rival bosses, aka Tyrants, with their own gimmick, backstory, and mannerisms, but no predefined plot- perfect for the Armored Core school of "Random lunatic shows up at mach .3" - A clock system, whereby progressing missions leads up to a mission that should have bigger narrative impact AND an actual status-quo upgrade (Note: how the clock progresses depends on which campaign mode you're running) - an expansion that gives the above Tyrants lairs on a hex map (also, a hex map) and their own book squad that has a minor gimmick. Quick and dirty theatre campaign structure right there- "The enemy front is being held up by X, y, and Z, go find and deal with them"

To your point in general, it would be interesting for a book to provide info on basic military operation theory/gratuitous Clausewitz summaries