Continental Navy sloop-of-war Fly (8 guns) along with Continental Navy sloop-of-war Mosquito (4 guns). Both ships were mentioned as being on station in Delaware Bay with Fly watching six British ships in a letter dated 30 December 1776. This image from a 1974 painting by William Nowland Van Powell is currently in the U.S. Navy Art Collection
The Navy marked its 249th official birthday (well, technically begun as the Continental Navy) this week.
They released a well-produced 8-minute moto video, below, that is very decent.