Just curious, but if one serves for 2 qualifying periods during the overall qualifying dates, does one get a bar or some other endorsement ?
No bar on the medal itself, but of course the total time served all counts toward qualification for the Accumulated Service Medal. The 2011 issue of this medal, which is almost identical to the earlier award other than an extra stripe on the ribbon, is now awarded after a total of 720 days accumulated service (previously 1080 days). A bar to the ACSM can be awarded for a further 720 days accumulated service!
PN - re the QRA medal - I trust your tongue is firmly in your cheek