I really hope you guys are stubborn and keeping going, this is a sort of faction just like the UN that fits very well to the setting and theme of the game!
Keep it as realistic as possible regarding the structure and rank system, don't make it so that every second person is a officer on the higher scale, such as colonel, major, generals, you get my point Since being so few at this stage you should RP being group members out of a company, also give everyone their rolls such as medics, riflemen, drivers, support, etc
Here's a UN company structure chart to just give you an idea what I'm talking about, other then that I wish you very well and hope you don't give up on this!
And this second chart shows the structure of a UN Battalion (consists of 300-800 soldiers)
Also, note the numbers of officers in regards of how many soldiers there is!
Best of wishes, hope to see you grow!