Jackie and Fez discuss writing a letter to Eric to let him know that Donna is cheating on him. The next scene shows Red, Leo & Bob at the veterans reunion. The following scene shows Fez & Jackie talking about how it's been two weeks since they wrote to Eric about Donna and Randy. Then, the next scene shows Red, Leo & Bob still at the veterans reunion.
It's been established that Red is a veteran of two wars, World War 2 and The Korean War, since he makes references to both during the show's run.