This morning the Massachusetts Air National Guard flew five F-15s at low altitude (1000 feet) over several landmarks in the eastern portion of the state.  Their first destination was Hansom Air Force Base and I correctly guessed that their approach would take them over Great Meadows where I set up to photograph them.  Scheduled to arrive at 8:10am they were 15 minutes late and I was just starting to leave when I heard them approaching.  Without a doubt, these are the biggest and fastest birds I have ever observed at this wildlife sanctuary.