In the Pearl Harbor attack, people like Don Rae advocate sacrificing a battleship or bomber (instead of a cheaper fighter) as a "second" casualty as a "gambit" just to get American air forces to head for the Pacific instead of the Atlantic. Can one also make a case for electing NOT to take the sub as a (first) casualty?
Likewise, in a first turn Med naval battle, should Germany use its sub off France as "cannon fodder" in an attack against the British battleship off Gibraltar? Or should it have the sub try to take out the U.S. convoy off the Atlantic and let larger units deal with the battleship (and suffer the consequences).
Basically, is it sometimes better to take big warships or planes as potential casualties over a smaller, but more strategic unit such as a sub? Or is the loss in IPCs too much to bear (12 or 15 versus 8)? How do you make these choices? And, how, if at all, would your answer change if you had "super" subs.