Originally Posted by Gator

As for your question, I'm going to have to say the US Navy and the US Coast Guard?

You're half correct; the US Navy is the only US service to share its uniforms with other distinct, separate services. What are the other services? (Hint #1: there are only two, and the USCG is not one of them. Hint #2: I serve in one of the two services. )

NIH, I should have thought of the Surgeon General.

Is the other the Merchant Marine Fleet?

Originally Posted by Gator

NIH, I should have thought of the Surgeon General.

You're very close; NIH is simply an agency of HHS. What's the uniformed service of HHS?

Originally Posted by Gator

Is the other the Merchant Marine Fleet?

A very close cousin. The Merchant Marine Fleet isn't a full-time active duty US Federal uniformed service.

U.S. Public Health Service, and the other I'm not too sure about.

Ding! Correct on USPHS. Hint #3: think Hurricane Hunters with the Dept. of Commerce.

NOAA.
Thanks for the hint Lieutenant.

Yup; anyone have any others?

Lieutenant, since the United States Coast Guard used to be owned by the Department of Transportation until the Navy was granted control, and now owned by DHS, wouldn't the USCG be counted as a divorced agency until the Navy regains specific operational control during Wartime?

Hmmm, I wasn't aware that the Navy was granted control over the Coast Guard. In fact, if you read this on the Coast Guard page, it appears that they weren't -- it simply operates under the Navy during wartime (or if the President directs), but has always officially belonged to another federal Department (Dept. of the Treasury 1915-1967; Dept. of Transportation 1967-2003; Dept. of Homeland Security 2003-Present).

The Coast Guard's roots lie in the Revenue Cutter Service, which was founded on August 4, 1790 as part of the Department of the Treasury. An act of the U.S. Congress created the Coast Guard in 1915, with the merger of the Revenue Cutter Service and the United States Lifesaving Service. The United States Lighthouse Service was merged into the Coast Guard in 1939. The legal basis for the Coast Guard is Title 14 of the United States Code, which states: "The Coast Guard as established January 28, 1915, shall be a military service and a branch of the armed forces of the United States at all times." Upon the declaration of war or when the President directs, the Coast Guard operates under the authority of the Department of the Navy. The Coast Guard later moved to the Department of Transportation in 1967, and on February 25, 2003 it became part of the Department of Homeland Security.

http://www.uscg.mil/top/about/

It would have read better like this...

Lieutenant, since the United States Coast Guard used to be owned by the Department of Transportation until the Navy was granted control during Wartime, and now owned by DHS, wouldn't the USCG be counted as a divorced agency until the Navy regains specific operational control during Wartime?