| Date | Transaction |
| 02-28-2071 | Carl Koss has retired from football. |
| 11-24-2070 | The Las Vegas Vulcans have waived Carl Koss. |
| 11-24-2070 | The Las Vegas Vulcans have moved Eric Onkontz, Ernie Morris, and Jeff Kloppenberg to the active roster. The Las Vegas Vulcans have moved Andy Williams, Sean Davis, and Carl Koss to the inactive roster. |
| 09-06-2066 | The Las Vegas Vulcans have moved John Schulters, Joe Stone, Ernie Morris, Jeff Bowman, Aaron Henderson, Jay Hannah, Carl Koss, and Vern Wichard to the active roster. The Las Vegas Vulcans have moved Lawyer Whitman, Andy Williams, Dedrick Burgin, Luther Scott, Mike Raye, Doug Davis, John Abdullah, Lamar Campanella, John Mooers, and Tim Riopel to the inactive roster. |
| 12-28-2065 | The Las Vegas Vulcans have moved Dedrick Burgin, Marlion Roller, and Lawyer Whitman to the active roster. The Las Vegas Vulcans have moved Aaron Hoyem, Carl Koss, and Jay Hannah to the inactive roster. |
| 12-27-2065 | Carl Koss of the Las Vegas Vulcans is injured with a wrist fracture and is expected to be out for approximately 32 days. |
| 12-09-2058 | The Las Vegas Hitmen have moved Carl Koss to the active roster. The Las Vegas Hitmen have moved Bo Jarvis to the inactive roster. |
| 11-11-2058 | The Las Vegas Hitmen have moved Joe Schau, Herb Ane, Ralph Hunt, George Gaustad, Mike McHan, and Kyle Smith to the active roster. The Las Vegas Hitmen have moved Corey Turner, Bob Jones, Dennis Williams, Carl Koss, Tim Riopel, Kevin Driskill, and Bill Dworsky to the inactive roster. |
| 10-14-2058 | The Las Vegas Hitmen have moved Carl Koss to the active roster. The Las Vegas Hitmen have moved Bo Jarvis to the inactive roster. |
| 09-02-2058 | The Las Vegas Hitmen have moved Ralph Hunt, Derrell Janerette, Simon Ilg, Mike McHan, Kyle Smith, Hal Scribner, Mickey Freelon, Rodregis McDaniel, Mike Bell, Herb Ane, Woodchuck Robinson, Gene Thomas, and George Gaustad to the active roster. The Las Vegas Hitmen have moved Bob Jones, Dennis Williams, Corey Turner, Carl Koss, Tim Riopel, Kevin Driskill, and Bill Dworsky to the inactive roster. |
| 08-05-2058 | The Las Vegas Hitmen have moved Bruce Leon, Daniel Fowler, Corey Turner, Ron Winter, Bob Jones, Ed Avinger, Dennis Williams, Ralph Leggett, Andrew Sampson, Willie Roberson, Carl Koss, Tim Riopel, Ronald Dailey, Kevin Driskill, Herb Young, and Ndukwe Curry to the active roster. The Las Vegas Hitmen have moved Joe Schau, Mike Bell, Woodchuck Robinson, Gene Thomas, Chuck Papac, Herb Ane, Jack O'Neill, Ralph Hunt, Arnie Carter, George Gaustad, Derrell Janerette, Simon Ilg, Mike McHan, Kyle Smith, Hal Scribner, Mickey Freelon, Ed Lewis, Joe Cherry, and Rodregis McDaniel to the inactive roster. |
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