another try. Zephyr's mini tug reminded me that tugs, due to their huge machinery, high masts and short hulls, have an relatively 'boxy' shape from the side, making them fit better in an square icon then the warships we mostly have. so, I took the first navy tug I could think of and tried it out.
while the first one is a bad logo if it is small, on larger sizes it shows exactly what we do. the second one works better on small sizes, but when larger it gives absolutely no extra value to the word shipbucket, while SB would obscure the drawing behind it
of course, with the silhouette, I could do the same as I did with the bow on the ones posted above.
EDIT: wondering what is the most well known shipbucket drawing, to experiment a bit......