The Hawaiian bobtail squid is known to have a close relationship with a particular species of bacteria that lives within the squid. The bacteria are naturally bioluminescent, which is hypothesized to benefit the squid through counter-illumination.
According to a Howard Hughes Medical Institute (HHMI) BioInteractive:
Camouflage experts in the United States Air Force have studied the symbiotic relationship between the bobtail squid and Vibrio fischeri.
Materials science experts in the U.S. Air Force have studied the symbiotic relationship between the squid and its bacteria to see if the reflective qualities could be used to improve their aircraft camouflage.
While I don't doubt that the military has experimented with counter-illumination, it's less clear to me that the US Air Force has studied the Hawaiian bobtail squid specifically. Is there any evidence to support the HHMI claim?