I'll preface this by saying I am, in no way, an expert nor student of historical infantry tactics. My understanding of evolving US tactics during WWII is, because the BAR was unsuited to prolonged suppressive fire; having no quick change barrel and a magazine that could only be changed by the gunner, US platoons would, when available, add a second BAR to its squads, and more often form two equal fire teams, in the mould of the modern fire team principle. Interestingly, in game, if you hit the 'combine squad' function on a US 2-BAR squad it will make 2 teams, each with a BAR, and the 'assault' command will move them in bounds. Hopefully the historians and tacticians of the forums will be able to debunk or uphold my thoughts (?).