Agent Roswell

After Roswell incident of 1947 (prologue level), a Government task force is created to counter threats posed by UFO's and aliens. Set in 1969 USA, you're an Agent working for B.A.I.T (Bureau for Alien Investigation & Termination) assigned with investigating an Alien invasion; your work also requires dealing with terrorist organization S.E.T.A (Supporters of Extra Terrestrial Arrival), that wants to reveal truth behind invasion to public opinion.