Bruce Brown, 47, was facing charges after two separate incidents last year.
In August, Brown told a resident in Old Lyme, Conn. that he was a special agent with the U.S. Coast Guard. Later that same day, while out on a boat ride, he required two boat operators and a jet ski rider to produce licenses. When he was later questioned by authorities, he kept up the fiction that he was working under orders from the Coast Guard. Earlier in the year, in March, Brown offered to have a "scared straight" conversation with the sons of an acquaintance. He arrived at the person's home with a badge, a gun, and handcuffs. While alone in a room with one of the boys, Brown drew his gun, handcuffed the boy, and searched his room.
In August, law enforcement found a bulletproof vest, guns, and large amounts of ammunition in Brown's car.
Scott Brown has said that he is estranged from Bruce Brown.
Bruce Brown also pleaded guilty to one count of falsifying a military discharge certificate. (He was discharged from the Coast Guard in 2002 "under other than honorable conditions," according to the Associated Press.) He is scheduled to be sentenced on May 19.