Well, if they're like my stepfather, they tell you they have a better system for something than what you're employing/using. A way they 'like to do things'.
SIFFLE! <---- ?????
Back on topic - naval engineers speed up construction and repair of naval vessels. I am not sure, but think regular engineers help in siege prep, fortification construction, and repairing RRs. Not sure about any of that, though.
Except the stepfather part - that I know. Engineers - well, it takes all kinds....
EDIT: Rafiki haunts me.