You should watch for unexpended ordinance if the threat level is low. For instance, if one of your Su-24s dropped 2 out of 3 KAB-1500 Penetrators, and destroyed its target, it will head home with the third bomb still strapped on. You could, if you like, take over this aircraft and give it another target. Select it, hit "U" to un-assign it and you now have control. Either assign it to the general or sweep up mission you made earlier or give it a specific target. It's a shame to waste a perfectly good bomb!