Next league with Usarf

A couple points from me on it with the caveat that I don't like reworking someones list massively, mainly because I respect the fact that I have no idea what models you own or love so much you just HAVE to have on the table.
Group 2: IMO you don't have nearly enough orders in that group to feed the devil dog. with the airborne off the table and the desperado impetuous you can only activate him at most four times a turn. I'd trade him places with the naked grunt HFT in group one personally.
Speaking of, I'm not sure what your plan for that grunt is. He's an extra outside of the fireteam but having him around to reform the link if one dies seems situational and costly.you could rid of him for maybe a warcor and spend those points to upgrade your group two foxtrot to a BSG maybe.
Third, the Grunt HMG and blackjack will be fighting each other for orders most likely and make the grunt option a little redundant.
If you drop the Grunt HMG to a third sniper those three points could be used to upgrade the group two foxtrot to a FO at least for classifieds and a flash pulse and still leave you with enough points to sneak a hardcase with a shotgun in for a fun speedbump upfield.

 

Van Zant is probably not necessary in Firefight, since you can use Parachutist to get in behind the enemy DZ anyway. I'd take the Submachine Gun Airborne alone; basically all of Onyx's Lt options will die to one hit from a Shock round.

Take some time to read up on Onyx's Lt options, it's usually pretty obvious from deployment what/who the Lt is.

In Firefight I'd almost certainly want to run the Marauder fireteam for maximum pressure and destructive capability upfield.

 

Welcome to Ariadna!
I believe the best way to get USAriadna Ranger Force going is thinking of it as the PanO version of Ariadna. That is no fancy toys and nice trick just brute force rampaging.
Your core fireteam lacks focus. Is that a defensive or an offensive fireteam? Actually you can make this unit a two-way team:
Core
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7
ROSIE Light Rocket Launcher, Light Shotgun, D-Charges / Pistol, Knife. (0 | 22)
GRUNT Heavy Flamethrower, Light Shotgun / Pistol, Knife. (0 | 10)
GRUNT Heavy Flamethrower, Light Shotgun / Pistol, Knife. (0 | 10)
GRUNT HMG / Pistol, Knife. (1 | 21)
GRUNT HMG / Pistol, Knife. (1 | 21)
GRUNT (Marksmanship LX) Sniper Rifle / Pistol, Knife. (0.5 | 18)
GRUNT (Marksmanship LX) Sniper Rifle / Pistol, Knife. (0.5 | 18)
3 SWC | 120 Points
Open in Infinity Army
You have 7 troopers for 120 points and 3 SWC. You can take say a Dozer and two Traktor Muls filling another 3 slots and you have a full Group of 10 clocking in at 144 points and 3 SWC, that is half your points.
If you go secound you field the fireteam consisting of Rosalind (worth her weight in gold), the two snipers and the two HFt filler. During your reactive turn the snipers are on ARO duty. Once your turn starts (porbably losing one or two of the snipers) ou reform the fireteam and the two HMG Grunts go hunting. To spare points (and SWC) you can sack two of the guys. This choice is up to you. This back and forth shuffling is rather effective/spectacular/disgusting (depending on where you stand).
Now the next awesome unit I consider the strength of USARF is the Marauder Haris:
Haris
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3
MARAUDER (Fireteam: Haris) Rifle, Heavy Flamethrower / Heavy Pistol, Knife. (1 | 22)
MARAUDER Paramedic (MediKit) Rifle, Heavy Flamethrower / Heavy Pistol, Knife. (0 | 23)
MARAUDER (Multispectral Visor L1) Heavy Rocket Launcher / Assault Pistol, Knife. (1.5 | 26)
2.5 SWC | 71 Points
Open in Infinity Army
The above is the most popular set-up. Some players (including me myself) prefer the Molotok in lieu the HRL, but I admit losing the MSV1 kinda hurts. The whole unit clocks in at 71 points and 2.5 SWC and man, brings the pain big time. (73 points in case you take the Molotok.)
If you add this unit in G2, you still have 85 points and 0.5 SWC to spend preferably filling out 7 slots (12 points average).
Now is the time to turn to one of the burning issues of USARF listbuilding, that is taking a Lt.
Most Lt options cost SWC and USARF is the first most SWC hungry faction I ever played (and I played quite a lot of them). Foxtrot Lt clocking in at 2 SWC is almost prohibitively expensive. (Sometimes I take him in Vanilla Ariadna to get a Lt as safe as possible.) Forget him.
Airborne Ranger is an odd choice, because usig the AD would put you in LoL. Clocking in at 20 points and 1 SWC he is not cheap either. Avoid him.
Grunt Lt: the base 10 points 1 SWC profile is subpar, but you can get a light grenade launcher for 4 points more - now we talking.
Now we have Marauder and Minuteman left, and all three options are appealing. If you have the points (and SWC) you can take an agressive Lt on a discount in the AP HMG loadout. Too bad the CoC is prohibitively expensive. (41 points for a rifle is a joke.) You can take a Lt for zero SWC in the Minuteman or the Marauder. Both of them cost roughly the same and both of them are absolutely viable options. Which one you take is totally up to you.
Now assuming you take the Minuteman Lt, you have left 63 points and 0.5 SWC to spend (on a maximum of 6 troopers) with no real restrictions. In G2 you already have orders enough to operate the Haris. So pick your lollypop.
Some sugegstions:
Foxtrot FO: There are no words or expressions that porperly descibe just how awesome these troopers are. The golden standard for infiltrating camo troopers in the whole game. One fine trick is puting them in supressive fire. Using a co-ordinated order to put four troopers inSF mode is just hilarious. Just don't overextend them, that is no sitting atop a building in a sniper's nest, because he will be heavy machine gunned down in a pinch.
In case you field a few Foxtrot FOs, you should consider upgrading one Traktor Mul to a Katyusha. Whatever gets targeted, will be shot to pieces.
Foxtrot sniper. Yes, you read it right. People keep saying that infiltration and sniper rifle do not mix well. If you see a camo marker midfield in USARF you will be dead sue this is a short-range threat (BS or rifle). Park the Foxtrot sniper close to the sideline, and shoot down an unwary trooper across the table. Instead of the traditional North-and-South think in East-and-West to use this girly properly.
Maverick FO Mobile specialist throwing smoke with MSV1 and LRL. Nuff said.
112 Keep the guys up and fighting. The footslogging version is perfect to keep close to the Grunt snipers. The motorised version is vee a little bit expensive, but 1) mobile and 2) sports his own smoke. Doctoring became a thing in Ariadna.
6th Airborne: FO to push buttons (Well, not in Firefight…) and get opponents targetted SMG to kill opposing troopers by the truckload, MA for stealth.
Van Zant: Won me a couple of games singlehandedly.
Inferior Infiltrating Grunts: I am pretty sure, what to expect of them. I would like to add just one thing: take more, like 3 or 4 of them. The more you take, the more likely some of them shall land where you want him. The rest will make good DZ guardians.
Blackjacks: AP HMG day in day out. Too bad this beauty is very expensive SWC wise and lacks visual MODs to actually wil firefights. Make no mistake, this dude is NOT Achilles...
Hardcases: Misdirection incarnate.
Desperados: If you like bikers, you will just love those guys.highly mobile and will lay down smoke wherever you need them. Any self-respecting PanO player would do morally questionable things to get access to a trooper like this. (I play NCA and ASA.) Clocking in at 13 points these guys are cheap as chips, Double AssPiss for active turn harassment, SMG for putting in SF mode under smoke to make your opponent's life miserable in your reactive.
I hope, this helps.

 

The longer range of the AP Rifle was more than handy for me. (Less important in a very dense terrain set-up.)

 

In that case I'd suggest the rife/assault pistol Airborne.