Twice - both times back in in winter of 81/82. (I was stationed at the Clinic for a year).
I didn't have any luck but we were road hunting one day, just driving around taking shots at them, the next time I tried calling them but had NO IDEA what I was doing and was not successful...(everybody starts somewhere, I've learned a lot since then!)
There were, at that time, a lot of coyotes at the Firing Center. I'm guessing there still are...but it would be wrong to say there is no hunting pressure at the Center. There are a lot of people who hunt out there...Not as many as other places because of access restrictions, but it does get hunted...