[@ReusableSword]

Your CS is currently lacking in the character appearance aspect, you'll want to put a description of the character if you're not using an image. I'm (personally) willing to let your character keep the rank of sergeant, as he is the second in command, however this can easily be overturned by [@Fisticuffs]. 

I do find it iffy that Victor was able to keep the ONI operations a secret if 'his squad was constantly off mission'. If they were so, his superiors would be asking a lot of questions, I imagine. ONI usually forms teams by taking it's 'chosen' individuals from their original positions and making a new team out of them, as evidenced by the "Kilo-Five" trilogy, the team usually sticking together for months if not years with collars around their necks to be dragged at ONI's willing. They also have their own teams, for example, ONI Recon 111, the team which found and reported the Ark Portal during the second stage of the Battle of Earth, during the excavation.

ONI do, however, use mainstream infantry assets in some of their operations. There has been reported cases that ONI sends an attached operative with mainstream forces to make sure everything goes to their willing. It'd make more sense in your sheet if you put that the team was being ordered to go and do that stuff for ONI (with an attached ONI agent) than going off mission, which would lead him to the platoon leader's doorstep and if he was blatantly ignoring orders while doing the ONI operation, probably to a court marshal.

(I'm not even mentioning the parts where he individually gets pulled from his squad)

It'd be great if you could change your CS a bit based on that information.