Mhh, we play in PUGs mostly (so 2 as pair, 3 randoms) and we rarely need to communicate, at least in Incursion.
Of couse in such groups it can be that we get stomped by a 5-man-premade with excellent military & tactical communication - but such a thing is a rare case.
Helpfull military communication is a task most people are not capable off, instead its wild jibberjabber that distracts more than being a tactical advantage. At least thats how I perceive it so far.
Worst is when all 4 players try to communicate as much as possible to get the “tactical advantage the rival premade team has”. I rarely works, it gives me headaches and I can barely concentrate if all are pinging & talking…
At best is to flow with the team and make best use of situational awarness, that way you rely less on loud communication.
PS: Sorry, its totaly off-topic I guess >.<