The Atlanta Falcons have announced the signing of offensive guard Harland Gunn after backup lineman Joe Hawley received a four-game suspension for violating NFL rules on performance-enhancing substances. The 6-foot-2, 310-pound Gunn was picked up by the Falcons on Tuesday. Atlanta plays at Tampa Bay on Sunday.||||||| Gunn initially signed with Dallas as a college free agent after the NFL draft but was waived by the Cowboys and joined the New Orleans Saints' practice squad. He played collegiately at Miami. Hawley will be eligible to return to the roster after the Dec. 16 game against the New York Giants.