Might be a kinda long answer, but try to stick with me.

Godzilla surfaces in October 1992, resurfacing 3 days later. Sometime after that, Godzilla is bombed by B2’s, causing the first “offspring,” which (check the group desc if u dont know what im talking about) are the Redmass. After that, the GDA (Will be explained later) is founded, and Godzilla is temporarily frozen, and the Humanoids begin shedding off its tail, resulting in the formation of other defense teams. Note that these are in Japan, which probably has a different looking military then in the USA.