Immersion 1944 is a - finally - Singleplayer Mod for Company of Heroes 1. It provides tons of historical skins, several new missions and enhanced campaigns that are altered to better mimic the historical engagements, with more correct units, bigger vehicle choice and lots of random stuff that makes every single vehicle or soldier look unique.
The Airspeed AS.51 Horsa glider was extensively used on D-Day and during Operation Market Garden. The model replaces the american Halifax glider for British Commando Doctrine and in the Operation Market Garden campaign.