Park officials said Antonio Scott was swimming across the lake when he began to struggle.
Master Sgt. Brian Tolliver, a 25-year veteran, died Monday following a long battle with the illness.
According to Pentagon data, a 5th U.S. troop has died from the coronavirus; details have yet to be released.
Once all the caskets were aboard the C-17, a Navy chaplain aboard the plane said a final prayer.
Sgt. Trevor Goldyn, a communications Marine, was found dead in a "non-combat related incident."
A Marine sergeant drowned after going for a swim after a unit physical fitness event in Macon, Georgia.
The service member was assigned to Naval Amphibious Force, Task Force 51/5th Marine Expeditionary Brigade.
Spc. Curtis Fort, from Roanoke, Virginia, died July 30 from complications related to the virus.
The number of COVID-19 infections doubled in the U.S. military in July.
The Marine amphibious assault vehicle that sank off the coast of California last week has been located in 385 feet of water.
The campaign of President Donald Trump released a letter from 235 retired senior officers backing his re-election.
The news comes four years after the Air Force laid out initial plans for what its future fighter jets might look like.
The recent exercises were one of many the Air Force is conducting to test its Advanced Battle Management System.
A veteran of the Marine Corps and Army National Guard, he went through boot camp more than four decades ago.
Cmdr. Robert Arias is at least the third Navy commander removed from his job in recent weeks.