In N3 we could not link units that had a G:Synch. I've gone through the N4 fireteam rules and don't see this restriction. Army 7 doesn't seem to link to a wiki (at least for me) and the website link just goes to the old wiki, so closest I can find for peripheral rule is the code one version which doesn't mention fireteams. Anyone know if we can link them or not? Also, is the N4 wiki up and running? If so how do I get to it? Cheers
Who are you looking at that have the option? Guard Sergeants are specifically called out as not linkable in their profile. Also, the Peripheral rule (p.107) says neither they not their controller can be a member of a fireteam.