Retired Marine Gen. James Mattis, President-elect Donald Trump's pick for defense secretary, attended his Thursday confirmation hearing wearing only a Spartan helmet and boxers emblazoned with the words "Fuck ISIS" on them, sources confirmed.

A number of senators on the Armed Services Committee expressed shock after the 66-year-old entered the room shirtless, though some female staffers reportedly swooned over the retired general's ripped 8-pack abs.

"I only came here to do two things: kick some ass and drink some beer," Mattis said before removing his helmet and taking a seat at the witness table. "Looks like we're almost outta beer."