The Federals will assemble for preseason camp Jan. 31 at Jacksonville's Gator Bowl, and due among them will be one Boom Boom Bacon. Also known as Coy.

While the Redskins still cast about for defensive line help because of Perry Brooks' injury, Washington's U.S. Football League entry decided yesterday to give ex-Redskin Bacon a fling at 40. Pardon the expression, fling, what with the veteran of 14 NFL years now also a veteran of four pro wrestling matches (as "Boom Boom," out of Ironton Ohio), since the Redskins dropped him three games into 1981 season.

Bacon, NFL leader in quarterback sacks with Cincinnati 1976 and Redskin leader in stuffing the passer, 1978-79-80, becomes the 54th member of the Federals' roster. There probably won't be that many, though, when the club breaks Jacksonville camp Feb. 27, after having played scrimmages the 19th against the Tampa Bay Bandits and the 26th against an opponent to be named . . .

USFL's Oakland Invaders unveil blue and gold uniforms and sign a "youngster" in tight end Raymond Chester, 34, to rejoin fellow ex-Raider Cedrick Hardman, 34 . . . Michigan State further depletes Philadelphia Stars' coaching staff, bringing in Steve Furness and Larry Bielat to assist George Perles, their would-have-been USFL boss . . . In the NFL, Miami's lately ballyhooed "Killer Bs" defense is minus a stinger, end Bill Barnett; torn ankle ligaments, surgery.