Due to this thread on TMP:
I am putting the files to the Xcom inspired game I ran in the latter half of 2008. They use Two Hour Wargames “Chain Reaction” rules (the basic rules are FREE), with some modifications (the armour effect) from the supplement 5150. Scenario 3 is a fighter combat game- the simple rules are presented here. It was a intro to the actual game – scenario 4.
I also ran two others. Scenario 5 was an alien attack on a town, with civvies running about. This is where I used the chrysalids along side normal warriors. If they ‘killed’ a human hand to hand, the human became a zombie type, and if that was killed it hatched another chrysalid.
Scenario 6 was an attack on the Aliens base on earth, hidden in Aztec ruins. I used a model of a Games Workshop Dreadnaught during this.
There was also a flash back scenario after #2- early hours of 6 June 1944, where the human player was the Germans dealing with suspected paratroops.
I ran the game as more of a GM/Umpire rather than play the aliens competatively. This allowed me to adjust difficulty on the fly. Part of this I realised that aliens were too few in number to be able to give first aid, so I came up with blood borne nano-bots. These make a first aid roll as though the alien was healing himself- ie roll REP or under. See Chain Reaction for details