Incident #115 — Greenville, South Carolina — 19 April 1948

This document details a UAP sighting that occurred on 19 April 1948 at Greenville Air Force Base, South Carolina. Two 1st Lieutenants from the 5th Liaison Squadron reported observing three objects in total—one initially, followed by two others. The witnesses were alerted to the objects by the sound of fighter aircraft in the vicinity. Upon searching the sky, they observed white, elliptical objects at an estimated altitude of 15,000 to 20,000 feet. The objects were initially stationary for approximately one minute before accelerating rapidly in a northerly direction and climbing until they disappeared from sight. The total duration of the observation was approximately two minutes. The witnesses explicitly noted that there was no audible sound from the objects and no exhaust or condensation trails. They initially considered the possibility of weather balloons but rejected this hypothesis due to the objects' rapid acceleration and climbing capabilities. The report includes a formal statement from the witnesses and sketches of the objects. Subsequent administrative correspondence between the Air Materiel Command and the Air Weather Service indicates that the incident was investigated to determine if synoptic weather balloons could have been in the area. The final evaluation, as noted in the Project Grudge report index and associated correspondence, concluded that there was nothing astronomical about the incident and suggested that the objects were likely balloons or aircraft reflecting sunlight. The document includes various internal routing slips, intelligence officer statements, and administrative records confirming the investigation process within the framework of Project Sign.