Just started playing this awesome game. I'll usually have 4 soldiers with assault rifles (plus 2 rounds of reload- same for the others), 2 with sniper rifles and 2 with grenade launchers (HE). As recommended, all of them have medikits, plus at least 2 frag grenades and 1 flashbang.
As for my secondary, I don't usually care much for it as I've never had to use it. Perhaps someone could advise me on it.
Usually I tend to split my troops up depending on how many entry points there are, depending on the situation, or where do my soldiers start or how big is the map. Its either the typical 2-man team (assault+sniper/GL) or a 4-man team (2 assault+1 sniper+1 GL). But as always, people have to get creative sometimes.
I just completed the mission in the Amazons. That one pissed me off quite a bit as I keep getting 1-hit KO by the alien lasers. Had to restart several times. I sent 3 assualt, 1 sniper and 1 GL to advance the eastern bridge while I had 1 assault hide behind walls of the house on the bottom left to scout for aliens. Near the ship, I had 1 sniper and 1 GL also scouting and taking pot shots at aliens. My GL couldn't do much as the range across was too far, but overall, I was able to maintain visual contact with all the aliens on my turn.