Probably Splash ... but in reality if you play SG games, you could use any type units for deployment Teams. Have DELTA, SEAL, RANGER, USMC Recon, etc., etc. go thru the Gate, but again I'm biased.

The USAF jumped right on board with even their Chief of Staff, General "what's his name" on the show. And a USN SSN popped up in the movie Stargate Continuum ... So it's all good ...

To answer your uniform question W/I, now all branches have their own version on camo uniforms. I think it was an esprit' thing. And so the media could easily tell who is who. Back in my day, at one point all branches wore the same standard temperate pattern BDUs. Even CVN deck crews. Today SEALs don't wear the blue "Aquaflage" the other sailors wear. When deployed on the ground. They'd most likely wear green or some version of the USMC camo uniform. Based on enviroment, of course ... That would go for all the other forces as well. Otherwise all their weapons would generally be the same. With all generally carrying M16s/M4s. And the M203 GL ... The USMC has a bigger version of a GL or light rocket launcher called a SMAW. If you like to keep to the show fluff, USAF would carry P-90s. On the show I've seen an accurate portrayal of M249 SAW LMGs ; M60, M240 MMGs and the occasional M2 .50 cal HMG. Being used by SG Tms. Plus as I've said, a Stringer MANPAD. I'd add some light AT weapons LAW/AT-4/Javelin, to be used to take out bad guys/aliens in hard cover. Or even a hovering El-Kesh ... [And I also remember an M249 shooting down a Wraith Dart too BTW.] I'd send in a recon MALP first as we've seen them do. Then when the 4-5 man SG Recon TM go thru with another MALP as an ammo carrier. Depending on the situation ... Packing extra ammo, light AT and AA weapons and even a .50 cal Sniper rifle[Barrett or Weaver, the US prefers the first one, the Canucks the latter]. Some extra hand grenades too ... Maybe some Claymores, depending on the mission ... You may need some firpower to take out those crew served Heavy Weapons, the heavy version of the staff weapon that the Jaffa use. Any AT weapon or even an M203 could do that, based on range. And the Barrett for long range shots. Those could nail the weapon or the crew ... I'd do both, weapon first then the crew ...

Hope that helps ...