In a countermeasure system for an aircraft, a countermeasure module includes a chamber. Countermeasure equipment is housed in the chamber of the countermeasure module. An attachment mechanism allows for releasable attachment of the countermeasure module to an aircraft. A flight mechanism is provided on the countermeasure module for returning the countermeasure module to a location, such that when an aircraft to which the countermeasure module is attached reaches a desired airborne position, the attachment mechanism releases the countermeasure module from the aircraft, and the flight mechanism on the released countermeasure module returns the countermeasure module to the location.