The six rays and the five spaces between refer to the numerical designation of the organization. The strangler fig tree is indigenous to tropical America and indicates that the Canal Zone was the home area of the Battalion for many years. The ocelot, a native of Panama who roams as fare south as Patagonia, further signifies the character of the organization as this animal usually climbs trees and fights upwards for it's prey. The sample of the insignia depicted was originally approved for wear by the 65th Coast Artillery on September 21, 1925. I obtained it from Fort Bliss.
More research is still under way.
Steve Spray is also drafting a historical summary of the units deactivation in the 70's, which I will publish when complete. I will also scan a black and white photocopy I have of the unit crest and insignia sometime soon.