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Guard Duty is the name of the second campaign in Operation Black Mesa and is an upcoming fan-made re-imagining of Half-Life: Blue Shift developed by Tripmine Studios. It is considered a companion to the Crowbar Collective's Black Mesa, though the two developer teams are not associated with each other.
Guard Duty began its development under the working title "Barney's Tales."
In late 2008, the original team disbanded, leaving the project in limbo. Some of the team from Operation: Black Mesa came to help revive the work, and one of their main level designers became the leader of the project, who then started contacting some of the former team members to release some of the work. They released the teaser Media of the restarting project, only changing the title to Guard Duty a tribute to a former name of the original Blue Shift.
Development Timeline (Ongoing)
On January 28, 2012, the team merged with the Operation: Black Mesa developers and formed Tripmine Studios. At the same time, they released the first update media for both projects.
On May 1, 2012, the team announced the second update of the media after the merging of the two teams.
On September 19, 2012, they released the cover art for the mod in Russian, posted on Facebook.
On December 8, 2012, they released more screenshots and concept arts for the project in the following event of the 2012 MOD of the year.
On February 17, 2013, they announced the Greenlight vote for both projects on Steam.
On May 28, 2013, they released a video demonstrating NPC combat AI.
On March 29, 2014, they released screenshots and concept art from both games in a media update. 
On January 16, 2017, a monthly update post was posted on the Tripmine Studios Forum.
On July 28th, 2018, A summer update post detailing the studio's progress on both projects was posted on the Tripmine Studios Forum.
On June 3rd, 2019, Another summer update post gave fans a much closer look at in-game weapon and character animations.
The main objectives of this project:
- A complete re-creation of each chapter.
- Models and sequences will push the game engine to the limit.
- Multiplayer will be completely different then other modifications. Rather than a Deathmatch mode, there will be Team Deathmatch and Capture the Flag modes. There will be a "running, surviving, and working together" game mode, with the purpose of escaping the facility before it is completely destroyed. This won't be in the initial release.
- New voice acting, sounds, and visuals.
- Level design of the chapter will be expanded. It will utilize the Source Engine.
- Complete original music tracks that is not sharing with the original game.
- An all-new soundtrack.