Daily objectives offer a consistent source of 15 Medals each.
Conquering missions on Suicide Mission, Impossible, or Helldive difficulty levels promises higher Medal rewards
Short, intense missions focused on eliminating specific enemy targets within strict time limits offer Medals as rewards.
Keep an eye out for yellow beacons marking drop ship locations on the map, which often yield valuable Medals
Scour the environment both in and out of missions for half-buried cargo containers containing Medals.
Team up with friends to crack open bunkers scattered throughout missions, as they frequently house Medals