The NATO-led Resolute Support Mission (RSM) was a non-combat mission launched in January 2015 to train, advise, and assist Afghan security forces, ending in September 2021. The "Operation Resolute Support" medal is awarded for service in this mission, and the "X 300" is a specific type of bar for the medal ribbon used for certain countries or services, indicating a specific qualification or tour. Qualifying for the medal requires a minimum of 30 consecutive days or 60 accumulated days within a two-year period of service in the designated area of operation.