The Osler-type Federation starship was in use by Division 14 in the early 2380s.
This ship type was smaller than California-class in size, and capable of atmospheric entry and landing.
The Osler had a black hull with a darkened interior, in reference to this design style, it was later suggested by the Edosian medical specialist that Division 14 should "maybe paint the ship some friendlier colors [and] turn on some lights, so it isn't so creepy." (LD: "Much Ado About Boimler")