TacOps is a turn-based 2D tactical game originally released in 1994. The game was developed by retired United States Marine Corps Major I.L. Holdridge, and details modern, hypothetical combat between U.S. and Canadian troops versus a fictional enemy force armed with various realistic international equipment. The game uses a realistic map-style grid rather than hexes or squares. Game play is divided into two phases; an orders phase in which time is paused for both players to enter unit commands, and a combat phase in which these orders are executed and the players can only watch the results as 60 seconds of game time passes. The game's execution is thus identical to that of Combat Mission.

• 1994 TacOps for Macintosh v0. Arsenal Publishing.
• 1996 TacOps for Windows v1. Arsenal Publishing.
• 1998 TacOpsNZ v2. Custom version licensed to New Zealand Army. Avalon Hill Game Company.
• 1998 TacOps Classic Edition v2. Avalon Hill Game Company.
• 1998 TacOpsMC v2. Custom version licensed to US Marine Corps. Avalon Hill Game Company.
• 1999 TacOpsCF v2 and v3. Custom versions licensed to Canadian Forces (Canadian Army). Battlefront.com.
• 2000 TacOps v3. Battlefront.com.
• 2000 TacOpsCav v3. Custom version licensed to US Army. Battlefront.com.
• 2002 TacOpsCav v4. Custom version licensed to US Army. Battlefront.com.
• 2002 TacOps v4. Battlefront.com.
• 2003 TacOps ANZAC v4. Custom version licensed to Australian Army and New Zealand Army. Battlefront.com.
• 2004 TacOps ANZAC v5. Custom version licensed to Australian Army and New Zealand Army. Battlefront.com.
• 2003 TacOpsMC v4. Custom version licensed to US Marine Corps. Battlefront.com.
• 2004 TacOpsMC v5. Custom version licensed to US Marine Corps. Battlefront.com.
• 2006 TacOps v4.0.6 AH (Current patch level as of 1/10/2008)

TacOps '98, a version released by Avalon Hill shortly before the company's demise. The original was marketed simultaneously as TacOps Classic, available only by direct sales through Avalon Hill.