For four years the U.S. public has wondered [about] the strange and insistent tales of eerie objects streaking across American skies. Last week the U.S. Air Force made known to LIFE the following facts: As a result of continuing flying saucer reports the Air Force maintains constant intelligence investigation and study of unidentified aerial objects. A policy of positive action has been adopted to find out, as soon as possible, what is responsible for observations that have been made. For the first time the Air Force (while in no way identifying itself with any particular conclusions) has opened its files for study. Out of this exhaustive inquiry these propositions seem firmly shaped by the evidence: * 1. Disks, cylinders and similar objects of geometrical form, luminous quality and solid nature for several years have been, and may be now, actually present in the atmosphere of the earth. * 2. Globes of green fire also, of a brightness more intense than the full moon's, have frequently passed through the skies. * 3. These objects cannot be explained by present science as natural phenomena -- but solely as artificial devices, created and operated by a high intelligence. * 4. Finally, no power plant known or projected on earth could account for the performance of these devices.