The phrase "a platoon serving" is correct and usable in written English.
It can be used to describe a military unit that is currently engaged in a specific duty or mission.
Example: "The report detailed the activities of a platoon serving in the region during the conflict."
Alternatives: "a platoon on duty" or "a platoon deployed".
A little like old World War II movies where a platoon served as a crucible for an idealized cross-section of America — the softhearted tough guy from Brooklyn, the standoffish bookworm, the fast-talking card shark, et al. — a bank robbery in "The Nine" throws together an array of contemporary archetypes.
Restrepo by Tim Hetherington and Sebastian Junger winner of the Documentary Grand Jury Prize at Sundance observed members of a U.S. Army platoon serving in one of Afghanistan's most dangerous outposts.
Three and a half years later, in 2007, the platoon served its second tour in Iraq.
He has commanded a platoon in battle, served as supreme allied commander in a time of war, and worked on behalf of peace in the Middle East.
They were just a couple of entrepreneurs who thought they could make a living from a "barbecue pit", using a platoon of waiters to serve motorists who sat in parked cars.
He served as a Platoon Leader and Company Executive officer with the First Battalion, 27th Infantry Regiment, serving sixteen months in Iraq.
He is an infantry officer and deployed to Iraq serving as a platoon commander and company executive officer in Anbar and Nineveh Provinces.
At the time, he was serving as a platoon leader in a battalion of as few as six hundred and fifty marines, who had been given the impossible mission of trying to control an insurgent-ridden area the size of three counties in his native North Carolina.
One dreadful day stands out, the day that multiple bombers struck a village near the combat outpost where he was serving as a platoon sergeant.
