In what year did the Air Force approve the first trial issue of the security police (SP) shield?

The correct answer is 1957 because that year marks the official approval for the first trial issue of the security police shield by the Air Force. This significant development was part of the evolution of the Air Force’s security forces, distinguishing them and recognizing their specialized role within the military. The introduction of the SP shield served to professionalize the security personnel and enhance the identity of the Air Force’s law enforcement capabilities. Understanding the historical context helps to appreciate the ongoing changes within military policing and the establishment of specialized units.