Since the B-26 bombers were not fitted to return to her decks, there could be no practice take-offs. However, everything possible was rehearsed. A special catapult had been built to insure each bomber flying speed before it reached the end of the flight deck. The engines were checked and tested and tuned until their engineers could swear to their perfect condition. The new bomb releases were objects of especial care. At the last crucial second as they swept toward the target, nothing must go wrong.