In the old days, we called this losing the game. All your units defeated you need to start over.
But seriously, it sounds like you made some errors, lost your forces and are now upset there's not a retry button? I don't know, reading the TA forums it does sound like you can just start the next mission with no pilots, skip it (failing it) and eventually your pilots will be back for duty?
There's no retry button, but there's a $.99 Get Out of Jail IAP. =p
I wish there was a real fail state instead.