As someone familiar with miniature wargames but new to Dust (Tactics or Warfare), it took me some time to figure out that while some of the units represented in the book are easily available as standalone boxes, some of them are not. I put together this quick reference for myself, which I thought other new players might also find useful. Each unit is linked directly to the product in the FFG store you'll need to purchase to get the unit in question (you can buy 'em wherever, it was just easiest to reference them here). I've also listed the units in book order to make 'em easier to navigate.

ALLIES
"The Boss" Ranger Command Squad
"Corps Officers" Heavy Ranger Command Squad
"Hell Boys" Ranger Attack Squad
"BBQ Squad" Assault Ranger Squad
"The Gunners" Combat Ranger Squad
"Death Dealers" Ranger Weapon Squad
"Recon Boys" Recon Ranger Squad
"Crack Shots" Sniper Team
"13 Foxtrot" Observer Team
"The Hammers" Heavy Ranger Assault Squad
"Grim Reapers" Heavy Ranger Attack Squad
"Tank Busters" Heavy Ranger Tank Hunter Squad
"Red Devils" British Paratroops
LAW MI-A "Wildfire"
LAW MI-B "Blackhawk"
LAW M1-C "Honey"
MCW M2-A "Mickey"
MCW M2-B "Hot Dog"
MCW M2-C "Pounder"
MCW M2-F "Steel Rain"
HAW M6-A "Punisher"
HAW M6-B "Fireball"
Bazooka Joe (Not currently available)
Rhino
Action Jackson
Rosie
Ozz 117
The Priest
Johnny One-Eye
The Chef

AXIS
Kommandotrupp
Heavy Kommandotrupp
Sturmpioniere
Battle Grenadiers
Laser Grenadiers
Recon Grenadiers
Axis Zombies
Sniper Grenadier Team
Beobachter Team
Axis Gorillas
Heavy Recon Grenadiers
Heavy Laser Grenadiers
Heavy Flak Grenadiers
Lt. Panzer Walker I-A "Heinrich"
Lt. Panzer Walker I-B "Hermann"
Lt. Panzer Walker I-C "Hans"
MPW II-A "Luther"
MPW II-B "Ludwig"
MPW II-C "Lothar"
MPW II-D "Loth" (Not currently available)
HPW VI-A "Konigsluther"
HPW VI-B "Sturmkonig"
Sigrid Von Thaler (Not currently available)
Lara
Grenadier X
Markus
Manfred
Angela
Stefan
Totenmeister

If I'm not mistaken, the two characters that I've got listed as "not currently available" were in the original core set and the "Loth" was a limited run model available at conventions and trade shows. If there are any mistakes or corrections, please let me know. I'll happily update this post.

the loth is currently only as a promo model. It is usualy given out as a tournament prize. Alterativly it can be easily made by modifying a kampfangz.

You can create Loth if you have two medium walkers, the arm is not glued, just pry it with a screwdriver where the joint is and you can change its facing. Just don't brake it, I found out that the guard sits very tight there, so I wouldn't bother taking it out.

Great list.

Also worth mentioning is that the allied Infantry-2 platoons have shared figures. As far as I can tell, the two allied I-2 squads from the core set can be recreated by mixing and matching from the other booster sets. That will leave you with leftover figures, but at least it means an allied I2 force can be reconfigured.

Not so with the allied I3 or any of the axis units, which means I hope they release these as boosters soon. It's fine for a board game, but for a wargame, it sucks to be relying on the core set to get individual pieces, especially for basic units.