Get the Imperial Assault Campaign module for Vassal from http://www.vassalengine.org/wiki/Module:Star_Wars:_Imperial_Assault
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Can the Junk Droid activate several times per round if there are more than one Ughnaught on the map?
Yes. Scrap Batallion says the Junk Droid readies at the beginning of each Ugnaught's (group) activation and activates as-if part of each Ugnaught's group (which means it activates either before of after the Ugnaught figure).