Once all the caskets were aboard the C-17, a Navy chaplain aboard the plane said a final prayer.
A Marine sergeant drowned after going for a swim after a unit physical fitness event in Macon, Georgia.
The remains will be transported to Dover Air Force Base for preparation for burial.
Defense Secretary Mark Esper said that the massive explosions that devastated Beirut were most likely a tragic accident.
The scale of the damage resembles other blasts involving the chemical compound commonly used as an agricultural fertilizer.
The AAV, which sank after taking on water while training, had 16 troops aboard in total.
Officials announced early Sunday that leadership determined little likelihood the service members survived the accident.
Amphibious vehicles — commonly called "Amtracks" — have been part of the Marine Corps' fighting force since World War II.
Lt. Gen. Joseph Osterman said "literally every asset we have available" is searching for seven Marines and a Navy corpsman.
The Marine Corps will inspect its fleet of amphibious assault vehicles after one took on water during a training mishap.
A UH-1N Huey with 1st Helicopter Squadron was on a training mission when its crew was forced to make an emergency landing.
The former officer received kickbacks in a $5 billion health scheme involving compounded medicine prescriptions.
One of the children suffered injuries including a fractured skull, a broken arm and a fractured spine.
The Air Force's newest combat search-and-rescue helicopter, the HH-60W Jolly Green II, hit another milestone.
He was booted from service five months before retirement for a child molestation conviction 10 years before.