With fewer than 45 days until Election Day, Senator Scott Brown was in Washington today—and not on the campaign trail—because of National Guard duty.

Brown, a colonel in the Maryland National Guard who works as a military lawyer in the Pentagon, was set to return to Massachusetts on Thursday to resume his campaign against Democratic challenger Elizabeth Warren.

Military service, though, was not the only thing on Brown’s schedule during his time in the capital.

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He attended a campaign fund-raiser tonight at a restaurant on Pennsylvania Avenue. He had another scheduled for Thursday morning on Capitol Hill.

Brown, 53, joined the Massachusetts National Guard in December 1979. A lawyer by training, he serves as a judge advocate general, providing legal services to the military and its members. He transferred to the Maryland Guard in February.

As with all Guard members, Brown is required to serve one weekend per month, known as drill duty, and 15 days each summer, known as annual training.

“He fulfills his National Guard duties as directed by his commanding officer,” said Colin Reed, the senator’s campaign communications director. “He is in good standing and continues to carry out his orders, just as he has done for the last 32 years.”