Dana W. White is the top spokeswoman for Defense Secretary Jim Mattis.
The Marine was reported missing Thursday in the Sulu Sea.
The shooting occurred Feb. 17 on a base in the Middle Euphrates River Valley.
The move would establish the first new military department since the Air Force was founded in the wake of World War II.
The plan could lead to the first new branch of the military in more than 70 years. But some in the Pentagon have concerns.
The rapidly evolving electronics market "presents significant risk," a senior Pentagon official said in a new memo.
The U.S.-trained force is busier than ever but is facing allegations of civilian casualties.
The president suggested Pyongyang’s action was a sign that leader Kim Jong Un is keeping promises he made during denuclearization talks last month in Singapore.
The Pentagon would 'obviously like to continue' repatriation efforts, Mattis said.
The repatriation of the remains of missing troops was agreed upon in June.