| Date | Transaction |
| 02-28-1997 | John Simmons has retired from the Cleveland Tomahawks. |
| 12-26-1993 | John Simmons of the Cleveland Tomahawks is injured with a hip contusion and is expected to be out for approximately 7 days. |
| 10-24-1993 | John Simmons of the Cleveland Tomahawks is injured with a shoulder ligament sprain and is expected to be out for approximately 22 days. |
| 01-11-1988 | Trade #62555 has been completed between the Winnipeg Tomahawks and the Washington Xenomorphs. The Washington Xenomorphs receive Mike Guthrie (QB) from the Winnipeg Tomahawks in exchange for John Simmons (DE). |
| 08-30-1987 | The Washington Xenomorphs have moved Dave Richardson, Wilbur Cunningham, Ephraim Grant, Cedric Fluorine, Dick Early, Raymond Rose, Craig Baggett, Jimmy Saimes, Fred Caleb, John Simmons, Eddie Garbarczyk, Charley Belden, Dan Breitenstein, Mac Rembert, Freddie Stephens, Jeff Seymour, and Jim Cross to the active roster. The Washington Xenomorphs have moved Kevin Brown, Eugene Sloan, Kevin Annan, Chris Laurinaitis, Alex Thomas, Alonzo Moss, Steve Forrest, Bob Barnes, Joe Simon, Halvor Elway, Jim Mitchell, Billy Barber, Kyle Davis, Devone Rivera, Ron Barni, and Norman Rosenstiel to the inactive roster. |
| 08-24-1987 | The Washington Xenomorphs have moved Kerry Middleton to the active roster. The Washington Xenomorphs have moved John Simmons to the inactive roster. |
| 08-24-1987 | The Washington Xenomorphs have moved John Simmons to the active roster. The Washington Xenomorphs have moved Kipp Roberts to the inactive roster. |
| 08-23-1987 | The Washington Xenomorphs have moved Kevin Brown, Eugene Sloan, Kevin Annan, Pete Kahler, Alex Thomas, Alonzo Moss, Steve Forrest, Steve Gurode, Bob Barnes, Frank Fox, Malcolm Faulk, Halvor Elway, Jim Mitchell, Lamar Crudup, Billy Barber, Kyle Davis, Ken Williams, Devone Rivera, Duke Collins, John Kline, Ron Barni, and Norman Rosenstiel to the active roster. The Washington Xenomorphs have moved Dave Richardson, Wilbur Cunningham, Ephraim Grant, Dick Early, Raymond Rose, Craig Baggett, Jimmy Saimes, Lynn Liske, Minion "Perfect" Peyton, David Gardner, Fred Caleb, John Simmons, Mark Word, Eddie Garbarczyk, Charley Belden, Kipp Roberts, Phil Swartwoudt, Mac Rembert, Freddie Stephens, Chad McKalip, Jeff Seymour, and Jim Cross to the inactive roster. |
| 08-16-1987 | The Washington Xenomorphs have moved Dave Richardson, Wilbur Cunningham, Ephraim Grant, Henry Hands, Cedric Fluorine, Dick Early, Jimmy Saimes, Dave Riley, Craig Evans, Fred Garlich, Lynn Liske, Minion "Perfect" Peyton, David Gardner, Fred Caleb, John Simmons, Mark Word, Eddie Garbarczyk, Kelen Williamson, Charley Belden, Kipp Roberts, Phil Swartwoudt, Jim Scott, Freddie Stephens, and Jim Cross to the active roster. The Washington Xenomorphs have moved Kevin Brown, Eugene Sloan, Kevin Annan, Pete Kahler, Alex Thomas, Alonzo Moss, Steve Forrest, Chase Jackson, Milan Hubka, Steve Gurode, Bob Barnes, Joe Simon, Malcolm Faulk, Jim Mitchell, Lamar Crudup, Billy Barber, Kyle Davis, Ken Williams, Devone Rivera, Duke Collins, John Kline, Dan Breitenstein, Ron Barni, and Norman Rosenstiel to the inactive roster. |
| 08-10-1987 | The Washington Xenomorphs have moved Henry Reed and Charle Summerell to the active roster. The Washington Xenomorphs have moved John Simmons to the inactive roster. |
| 08-05-1985 | The Washington Xenomorphs have moved Ryan Johns, John Simmons, and Devone Rivera to the active roster. The Washington Xenomorphs have moved Dave Mohr and Reggie Rambo to the inactive roster. |
Defensive End