US Navy fighter pilots will say "Fox Three" over the radio when they fire a radar guided missle to let friendlies know there's a missle out there and to keep clear. (Infrared guided missiles are "Fox Two". Technically firing guns would be "Fox One". But if a jet is close enough to fire his gun, it's probably a bit too intense to be talking on the radio at that point.)

The pilot would call, "Splash" to indicate the plane is hit and going down, meaning it's going to fall into the ocean.

In other words, we got one of the bad guys.