This is a nice adjunct to the Omega Force saga. It is NOT Omega Force so it can stand alone but if you plan on reading Omega Force then read that series first. I read Marine first and while there weren’t any serious spoilers there was enough that I wished I had read the Omega series first and then this one. Having said that, if you’ve already started Marine, then finish it. Darn good tale. Then be sure to get going on Omega Force.