What is the difference between countermeasures and missile jammers?
Again not much. Missile jammmers are just countermeasure droppers that don’t require ammo and droop invisible flares. Because missile jammers fire much more rapidly than countermeasure droppers each flare has a smaller chance of misleading the missile. Also the jammers almost have to be run on automatic because it is overly taxing to manually fire all the fares they need to.