U.S. Air Force Tech. Sgt. Joshua Krape, 4th Operations Support Squadron survival, evasion, resistance and escape specialist, middle, sets off a smoke grenade during an ROTC tour at Seymour Johnson Air Force Base, North Carolina, April 8, 2021. The demonstration showed cadets from North Carolina Agricultural and Technical State University how smoke grenades are used for signaling and marking areas which are able to be seen from long distances. (U.S. Air Force photo by Airman Jordan Colvin)