UNSC Tactical Simulator
From Halopedia, the Halo wiki
Unlike the War Games training in the Infinity's advanced combat deck, the Tactical Simulator is a smaller-scale program that functions on data pads. As opposed to having the users engage in direct, fully simulated combat, the TACSIM employs more abstract mechanics, producing either fully hypothetical scenarios or recreations of historical battles with users assuming the role of soldiers who participated in those engagements.
Some events presented in UNSC Tactical Simulators have historical inaccuracies in their portrayals, such as a Spartan IV appearing in place of ODST squads during the Battle of Mombasa in 2552, when no Spartan-IVs were present at the time.
List of appearances