"Commission" is probably what's throwing people off. The game also uses "In Commission Sortie!", which is kind of awkward to read. The button itself would probably be better off being shortened down to just "Sortie", with the in-progress message rewritten to say something like "Sortie En-route!". I agree that it would be better to keep it in line with the flavor of the game. Save breaking the fourth wall for stuff like Pero Pero.