This bundle includes the following:

• Arma 3 Karts
  Start your engines and bring the battle to the race track. Arma 3 Karts features a 20hp 4-stroke engine go-kart, several kart liveries, playable race driver and marshal game characters, new kart-racing Time Trials and Steam Achievements, plus various race objects to build your own racetrack.
• Arma 3 Helicopters
  Master the exhilarating experience of rotary flight in Arma 3 Helicopters. Together with the optional RotorLib Flight Dynamics Model (FDM), Arma 3’s Helicopters DLC delivers two brand new heavy-lift helicopters, new playable content, new Steam Achievements, and more. 
• Arma 3 Marksmen
  Hone your shooting skills and engage in ranged combat. The Arma 3 Marksmen DLC includes seven new weapons, scopes, ghillie suits, firing drills, a new Showcase scenario, Steam Achievements, and more.