US Army is fielding the Carl Gustav MAAWS to IBCTs starting this year:
http://www.janes.com/article/60331/u...or-general-use. Previously these were only in the Ranger battalions.
The article says they will be organic to each rifle platoon, which I'm sure means an arms room concept, i.e. The weapons squad can carry either the Javelins or the Gustavs, or a mix of one and one.