we were in the park Saturday and saw helicopters on the way in but they were working on the utility lines. One man on the outside while the helicopter hovered over the transmission pole. quite interesting to see. never saw a military one though. One hovered over us as we sat at the stoplight to enter about 11 AM. Looked like they were checking the connection between the wires and the insulators. They spent about 5 minutes on each pole then moved to the next one.
Also, The bag check was harmless and did not seem to bottleneck anything. My daughters had their backpacks checked in les than 20 seconds each.