Hi. I know this is a wicked old question.
I was reading about the 75th Falcon Strike Cluster, the unit came on the scene in Field Manual: Updates.
Prior to that, the parent Galaxy, the Kappa. Were a provisional galaxy consisting of 3 clusters, 4th Falcon Strike Cluster, 8th and the 10th Provisional Garrison Clusters and showed up in FedCom Civil War sourcebook. I've gone through all my books, i can find the older 10th and 8th, and 4th Falcon Strike, but not the 75th. There was a 73rd that was defunct and there a 74th Falcon Strike Cluster.
Was the 75th a newly raised frontline unit or a missing unit from the home worlds?