Mechanical engineers build weapons. Civil engineers build targets.
I don't want to put a repost in my mouth
You can only fit three fingers in a bowling ball.
A tuba-four
Because the Chinese know how to build a wall.
Because there's Targets around every corner.
Target
RRRRtillary.
A weapon of mast destruction.
A Mechanical Engineer makes weapons, a Civil Engineer makes targets.
One builds weapons and the other build targets.