Help the Bombardier! I'm the Bombardier!
Despite the description, it is much easier to to take a Multiple Rounds Simultaneous Impact-like approach by firing one shell way, way off in the distance and firing another shell closer to the viewpoint, timing it such that the shells land at the same time.
MRSI in the real world is the practice of firing multiple shells to hit the same location at the same time. That technique is not possible with this quest.
The name for this achievement comes from the book Catch-22.
- Patch 4.0.3a (2010-11-23): Added.