Thanks all.
Well, there were real operations in which raiders landed by parachute or boat, did something, then withdrew. Even if there weren't many of the Hollywood variety, I would still like to simulate them.
At the moment I'm thinking about a delaying operation, perhaps France 1940, in which the player must prevent the AI from exiting the map by blowing a bridge or blocking a road or something. I could block a road with trucks, but then how do I abandon them where I want them?