Rambo, 24, was selected by the team in the sixth round of last year's NFL draft. He played in 11 games last season and started three, recording 42 tackles and one sack. He also played in both of Washington's games this season.
Rambo was presumably waived to make room on the roster for starting safety Brandon Meriweather, who returned to the team on Monday after serving a two-game suspension for a hit on Baltimore Ravens receiver Torrey Smith in a preseason game.
Ryan Clark, who the Redskins signed this offseason, is the team's other starting safety alongside Meriweather.
- Ben Estes