The vehicle is designed to protect against terrorists posing as recreational watercrafts or swimmers.
An unidentified small civilian aircraft flew into restricted airspace on Saturday, sparking an alert.
Levees and natural bluffs have protected most of Memphis from serious flooding but other areas are submerged.
All 13 workers escaped into the water, but the rig appeared to be leaking oil.
After 106 days and a historical spill record, the Gulf gusher has been stopped.
Engineers will pump heavy drilling fluid called "mud" into the cap in a bid to push the oil back down into the well.
A barge crashed into an oil well, sending crude spewing some 20 feet into the air.
Although the tests are still ongoing, the new cap appears to be preventing oil from gushing into the Gulf.
Officials fear that pressure increases caused by shutting off the flow of oil too quickly could create a new leak on the sea floor.
The energy giant is hoping their latest efforts will put an end to the leak in the Gulf of Mexico.