DM AFB is doing the annual heritage flight formation certifications again. I heard then saw a couple 51's practicing over the strip and circling around past the RV park on base. I was here a couple years ago at the same time and they had 51's, 47's (2 of them), a 38, an 86 and a mig 15 all flying in various formations practicing for the upcoming air show circuits. They are just starting now so I am wondering what they will have later today.