I managed to dig up the original walkthrough from the AOS homapages (thanks archive.org) and here it is for everyone.
ASSAULT ON ROSWELL (VER 2.0)
Alarming reports within the media have led the british goverment to send you on a trip to the back of beyond, place called Roswell, widespread insanity of the american populace has brought the country to it's knees, your mission if you choose to accept it is to infilitrate the Roswell base and stop a possible contamination of a deadly virus (maybe alien!) and eliminate any suspected parties.
Made by Migandi