Just for fun, I tried to imagine what an air-defense network would look like in the real world if it replicated the OOB rules. The result goes like this.
The network would consist of one or more AAA guns. Each gun would have an ammunition allowance of just three shells. The guns would all be tied to (and remotely operated by) a centralized fire-control system. The system would be coupled to a radar surveillance system that would track an enemy formation of planes as it arrives over the network’s territory. The network would assign a unique identification number to each plane, and would attach to each ID number an initial status code of 0 indicating that the plane it identifies has not yet been fired upon.
Now the battle begins. The network fire-control system targets one of the planes with one of the AAA guns and fires one shot. If the plane is hit, it’s detsroyed. If the plane isn’t hit, the network changes the status code of the lucky plane (identified by its unique ID number) from 0 to 1, indicating that it’s been fired on. The centralized fire-control system then orders the fired AAA gun (which now has only two shells left in its ammunition load) to stop tracking the lucky plane (in whose direction the AAA gun’s barrel is conveniently still more or less pointing) and to point itself at a completely different plane whose status code still reads 0. The firing-and-retargeting process is repeated until the first AAA gun runs out of ammunition. The network then orders a new AAA gun (if there’s more than one gun in the network) to go through the same routine, making sure that it scrupulously fires only at planes whose status code still reads 0.
This process continues until one of two things happens: the last AAA gun fires its last shell, or all the surviving planes overhead have been fired upon once and therefore now all have a status of 1. If, at the point where all the surviving planes overhead now have a status of 1, any of the AAA guns on the ground still have shells left in their ammunition supply, they are ordered to cease fire at the available targets overhead. Why they would be ordered to cease fire is beyond me. Perhaps it’s considered unsportsmanlike conduct for an entire air defense network to fire at any single enemy plane more than once. Perhaps the battle is being treated similarly to (one-half of) a pistol duel in which the two opponents – each armed with a pistol containing only one bullet – stand back to back, walk ten paces apart, turn and fire the single shot they’re allowed; if they miss, they call it a day and go home.