This patch is from the 416th Flight Test Squadron's Special Projects Flight working on advanced technologies for the F-16 Combined Test Force at Edwards Air Force Base. The phrase Procul Este Profani is usually associated with Virgil's epic poem the Aeneid. When Apollo arrives at the Temple of Apollo, the prophet Sibyl utters the words "Procul, O procul este profant" before the pair descend into Hades, where Aeneas is told about the future of Rome. Members of the unit translate the phrase as "Keep your distance, you who are uninitiated".