Starfleet is the U.S. Coast Guard

[Darkwing]

Among other nicknames. It's not exclusive.

[Star Wolf]

Infantry, including Marines are grunts. It is Vietnam era term from the grunting done to lift their packs to walk. As the army mechanized after Vietnam to take on the Soviets in Europe again grunts lessened in usage, the packs stayed in the APC for the most part.. However it was used in the movie Aliens to describe the Colonial Marines

[Star Wolf]

nightwind1 wrote:

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Nah, Soldiers are Grunts or Ground Pounders.

I think "ground pounders" is a specifically USAF term towards its parent's service. Like "leg" is used by parachute school qualified soldiers to describe all others or the armored force calls dismounted soldiers "crunchies".

I think "dog face" as a term has a history three times as long as "grunts". Legend goes that as the frontier towns built up around Army forts became more secure signs went up around town stating "soldiers and dogs keep off of the grass" to keep the Black and Irish soldiers away. In the Audie Murphy Story you can hear the US 3rd Infantry Division's song about dog face soldiers. And the communities around the post entrances full of "rent to own" stores, pawn shops, strip clubs and trailer parks are still called "dog towns"