As I recall, the Seceretary of Transportation said in an all-hands message in 1993 or 1994 (first Clinton Administration, about the time the “Don’t ask” thing was causing such a stir), that per his direction the policy of the USCG on homosexuality would NOT be the same as the DoD, but rather would be treated as described in my earlier post above. I worked for the USCG at the time.
While the CG does in practice adhere to much of the UCMJ (Uniform Code of Military Justice), as a part of the DoT, the Secretary of Transportation can and does issue policy directives which may add to or vary from UCMJ.
The mission of the USCG is significantly different from that of the armed services that form the DoD, as its homepage and various publications show.
Those familiar with the history of the service know that it was formed from the Revenue Cutter Service and the Lighthouse Service, neither of which were military services (part of the then Department of War). It was from 1915 (when today’s CG was formed, if memory serves me right) until the 1970’s a part of the Treasurary Deaprtment as befits its customs enforcing role. It is organized along military lines, but one could aruge that most US police departments are as well (with sergeants, captians, lieutenants, commanders, etc.). It has a military role in wartime or when assigned to areas where US forces are involved in conflicts, but its principal missions and indeed the majority of its missions are non-military.