The Defense Department is rolling out big changes to how it responds when the children of service members sexually assault each other - and the rollout has been uneven.

An official says the Pentagon is reviewing the federal security clearance held by tech billionaire Elon Musk, the founder and chief executive officer of SpaceX.

Outgoing Defense Secretary Jim Mattis is quoting President Abraham Lincoln in a farewell message to defense employees, urging them to stay focused on their mission. 

U.S. officials say President Donald Trump is expected to sign an executive order soon creating a U.S. Space Command that will better organize and advance the military's vast operations in space.

Defense Secretary Jim Mattis argues that the Defense Department is obliged to provide help.

Chief spokeswoman Dana White says pending litigation challenging President Donald Trump's order to ban transgender forces prevents her from answering even the most basic questions.

President Trump is firing Veterans Affairs Secretary David Shulkin and replacing him with the White House doctor in the wake of a bruising ethics scandal and a mounting rebellion within the VA. 

Transgender recruits will be allowed to enlist in the military beginning January 1, the Pentagon said, as President Donald Trump's ordered ban suffered more legal setbacks. 

The Pentagon says the two Army Rangers killed during a raid on an Islamic State compound in Afghanistan may have died as a result of friendly fire.