Maybe the Operation EPSOM in Normandy stood for Epic+Awesome
I like the way you think
To me APOS really captures that awkward feeling of anticipation while waiting for the enemy to arrive, especially during the night battles. A lone halftrack made the first mistake during its recon into town and was ambushed by a forward squad breaking the silence. Then all Hell broke loose.
PS. I find myself saying awesome a lot while playing APOS. I need to mix it up a bit and use a few more adjectives. Maybe I'll ask my wife to find the thesaurus, but, knowing her, she'd probably try to bring me a dinosaur.