Ubiquitous smaller versions of the Aerostat once used to try to catch illegals based at Sierra Vista, AZ.
Now, there is not need to spot illegals, but rather to provide a stationary drone platform from which to control those pesky citizens who will not conform.
“Now, there is not need to spot illegals.....”
Obama wants to move a bunch of minor illegals to the Aberdeen Testing Gounds there, so maybe there’s a chance INS will once again use blimps to monitor illegals.