Call of Duty: United Offensive Expansion Pack  - Mac Work with your squad through snow and rain, using new weapons including flamethrowers and deployable machine guns, or by calling in artillery strikes. Join the 101st Airborne for the climactic moments of the Battle of the Bulge. Fight as a British airman shooting down German ME-109&#8217;s from the gunner position of a B-17 bomber, before transferring to Churchill&#8217;s elite S.O.E. and clearing the way for the invasion of Sicily. Finally, follow your Russian comrades into the Battle of Kursk, one of the greatest tank battles of all time.