Because i don't have 100 rank icons. It will take few days to make them, but i don't think that it's important at the moment. If someone has experience in graphics design and is willing to help, then contact me.
Just a little tip, you can take inspiration from a game called Warface. It's got that style of ranks and you could just work off it. It won't be blatantly ripping off the game as long as you change it into something different. Again, just my 2 cents.