Frederick airport in Maryland served as the staging area for seven C-47’s last week. They were there in conjunction with a private plane fly-in and a Fly Over of Arlington Notional Cemetery. Most of the day was overcast and drizzly. Upon the return of the ‘47’s, the sky opened up. Here, one has landed and another aborted to go around for second attempt. I was OK under my umbrella until @Placid Lassie turned to park and I got the full effect of the prop wash.