There are a few things I like, and a few things I don't like about this squad. First, I like that you divided it into 3, 2, 1. The only real alternatives being 3, 3, and 2, 2, 2, are not as effective, I find. But I don't like the loadouts you have selected.

First, I think the scout is unnecessary. That's just my opinion. The scout also doesn't need a special loadout as long as he has binoculars, which everyone has. This means your scout will probably be doubling as a rifleman. His frags will obviously come in handy.

Also, I think you have too many support soldiers here. It seems your size-3 team in general would not be easy to work with because the sniper would have to drag the two support guys around, and also, the support guys could draw unnecessary fire and get the sniper killed. What I prefer is a platoon with fireteams of 3, 2, and 1.

Often, when I am playing with the WW2 mod War of Infamy, I give the lone man a mortar. Generally, using any mods, I give him one of three weapons: a sniper rifle, a heavy machine gun, or a mortar. I believe that all three of these weapons are effective support weapons, even the sniper rifle. A sniper can beat the crap out of an enemy just as much as a wall of bullets from a machine gun or a shelling from a mortar.

Now, when I am using the WW2 mod, I put 2 riflemen and 1 demo in the fire team of three, and then 1 rifleman and 1 demo in the fire team of two. I do this because I never give my riflemen a fully automatic weapon with this mod. I give the submachineguns instead to the demo guys, and give whatever rifle to the riflemen. Then I alter the secondary weapons of these guys to make sure I have enough grenades and antitank weapons to fight without the mortar support.

Of course, depending on what mods you're using, your riflemen might not have access to frag grenades. They can probably grab grenade launchers, and since pistols are generally useless, grenade launchers are probably the best secondary weapons for your riflemen in normal Ghost Recon. But, if you only have two demo troopers, they will probably both have antitank rockets.

It isn't a problem for me not to have frag grenades when playing normal Ghost Recon as long as my team has rockets and grenade launchers. Neither of these are as effective as grenades, IMO, so, depending on your own principles of squad composition (which I think is one of the most critical parts of coop or SP), you may want to substitute a rifleman for a demo armed with frag grenades, or, if there are no tanks in the mission, simply give your demo guys frags instead of antitank rockets.

Anyway the only real problems I see with this squad is the balance issue. I think if you were to get rid of one of the support guys, it would be OK to have a sniper and support in the same fireteam. I personally don't often use both a sniper and a support in my platoons, but if I do, I put one of them in my fireteam of 3.