
And I dont really know what you mean by removal. USF in coh2 is completely different faction than in vcoh. They were designed from scratch. So there was no removal, they were never ment to have snipers.
Flame units are available, many doctrines have assault engineer squads with flamers. One also gives flamers to rear echelon.
And there is a pack howie, stock unit that gives you both: smoke and fire in one ability called white phosphorus barrage.