More likely a test then actually shooting at anything. There are missile corridors in a lot of areas that few people, who do not read Flight Maps,
know about. For example, there are several right across the State of Florida. A major one that the Space Shuttle uses when landing, and several others
used for cruise missile testing. Missiles/Rockets tend to leave those zig-zaggy trails, I don't know the scientific reason for it, but it has
something to do with unburned propellant, especially during staging. We see them all the time from staged Rockets launched by NASA, down here. Very
pretty to see in person at dusk or dawn...