Paladin - I hadn't thought of implants. They would make more sense. I used tags embedded in the pants waist stitching and in the armoured suits for those characters who have them (Caesar and Zippo).<br/><br/>Remember too that Senjo is a big walking computer. She does it by the book, all the time, every time. No doubt her AI helps but still, once she detects a probability of friendly fire passing a certain threshold (whatever her training states) she'd switch the sentries off. I imagine the Corps is a bit twitchy about synths being in charge of robot guns (something of a double whammy) and if one of them made a mistake that resulted in marine deaths it wouldn't look good, so my take is that her programming errs on the side of caution.<br/><br/>I'm personally not a fan of deploying robot sentries in the same room as friendlies anyway, it seems like a recipe for disaster to me ;)