In the four branches of the US military, we have sailors, soldiers, airmen, and marines.
Is there a generic term to describe a current member of the US military whose service branch is not specified?
serviceman?
It depends on the context. Service member (SM) is used in a lot of official communications and regulations.
US Coast Guard is, much of the time it is ‘Coastie’ or ??
“Soldiers” is commonly used in news reports and such, without any implication that they’re referring specifically to Army personnel.
After Homeland Security took over the CG, they tried “Guardsmen”. The only people who liked that was the DHS people. Coasties didn’t appreciate people thinking they were in the National Guard and kept on using “Coastie”.
“Service Member” is branch and gender unspecific. Or is “inclusive” the proper word?
Warrior
‘Warfighter’ seems to be popular.
On radio commercials for defense contractors here in the DC area, I’ve heard the term “war fighter”; which to me is a silly term, since I’d wager service men spend a minority of their time actually fighting wars.
This is simply wrong with respect to the U.S. armed forces.
“Service member” is the preferred term. “Troops” can be used in some informal contexts.
Correct. Also applicable to the other uniformed services, the USCG, and USPHS and NOAA Commissioned Corps.
Even though “troops” (plural) does convey “people in the military” the idea of “troop” (singular) used to refer to an individual person in the military always strikes me as odd, if not silly.
Agreed, good clarification.
I thought maybe “enlistee.”
But that leaves out the commissioned officers and warrant officers. And, arguably, the NCOs.
4 year Navy vet here and never heard this one. Then or now I couldn’t be able to say it with a straight face.
Veterans or Serviceman.
Or informally; groundpounder, jarhead, squid and those lazy bastards playing volleyball in baby blue. 
You were never in the Cavalry. We were Troops or Troopers, not Soldiers.
Obama Regime Operatives?
All I was trying to say is that an individual being called a “troop” is like calling a cow a cattle.
See Troop Definition & Meaning - Merriam-Webster for the basis of my observation.
I’ll wager the same is true of firefighters; out of a 2080-hour work year, how many of those hours are they actually out fighting a fire?