*Assumption*
They seem to run parallels with AR team

AR DEFY
M4A1 AN94 Timid Girl Following the steps of a Big Sis
M16 AK12 The Big Sis
M4SOP RPK Fun Fatal Female Character
AR15 AK15 Silent but Loyal Comrade

This is just based on the initial art preview given to us.

So take it with a grain of salt