It is odd how the one US military unit best suited and organized for working through the Stargate has never been seen in any incarnation of the show.
I'm talking of course about the Army's Green Berets.
It is because of Rambo.
Actually the military "superstar" used for most fictional characters goes in cycles. It was the Special Forces but their coming out party, Vietnam fell in defeat. Then we started hearing nothing but SEALS, then it was the turn of USMC Scout/Snipers. Characters who were former soldiers were all Rangers. USAF PJs being rescue specialist were coming into vogue when 9/11 happened. But by that time the space soldiers of Stargate were already Air force.