Trena Carter, a member of the Untouchables cheerleading squad, was doing her stuff on the sidelines last week in Los Angeles, when suddenly she joined the Federals' injury list. She broke her ankle and will be out of action for six weeks.

She is not alone on the inactive list. When the Federals (0-2) play the Boston Breakers (1-1) at Nickerson Field here today at 1:30 p.m. (WMAL-AM-63), they will be without quarterback Mike Hohensee (fractured sternum), halfback Craig James (compression fracture of the upper dorsal spine) and wide receiver Reggie Smith (dislocated left foot). Also, tight end Phil DuBois (strained left knee).

Hohensee, James and Smith will all miss at least the next four games, and General Manager Dick Myers and Coach Ray Jauch have tried all week to find players to bolster the roster.

Myers said that he will sign former Pittsburgh Steelers quarterback Joe Gilliam and former St. Louis Cardinals linebacker Jeff McIntyre to contracts on Monday.

"Joe's arm has looked very good to us," said Myers. "The only thing we have to wait for is to see how long it takes him to pick up the offense."

Myers said he was not sure whether Gilliam would be assigned to the regular 40-man roster or to the 10-man developmental squad. Developmental players are paid a weekly salary rather than a full-year contract.

The Federals moved wide receivers Jeff Postell and Vince Kinney and fullback Mark Sanford from the developmental squad to the playing roster. Quarterback Chris Garrity, who earlier had been cut by the team, and former all-Canadian Football League offensive guard Mike Wilson also signed with the Federals.

Wilson, who was voted the CFL's most valuable offensive lineman in 1979-80, may well be the most welcome addition to Washington. In the team's opening losses, backs have had little running room and the quarterbacks have had inconsistent protection.

Kim McQuilken, who played after Hohensee's injury last week, was 15 of 30 against the Express and will start against the Breakers.

The Federals' defense has given up 48 points in the team's first two games and it faces a particularly effective quarterback today.

Johnnie Walton, 35, a former member of both the Los Angeles Rams and Philadelphia Eagles, was 17 of 28 for 163 yards in the Breakers' opening