More: At the time, many lawmakers, including some prominent Republicans, expressed puzzlement and dismay at Mr. Hegseth's decision.

"The reason it was mandatory was to enhance readiness," Senator Roger Wicker of Mississippi, the chairman of the Armed Services Committee, said shortly after the new policy was announced.

"You know, you do give up certain rights when you take the oath," said Mr. Wicker, who is an Air Force veteran. "It's just part of it."