One of Hostile Sector's goals is that each player should be able to customize their soldiers and give them a unique look. If you have ever played collectible games like Warhammer 40k you probably know that half (or even more?) of the fun is in giving your units some character.
Hostile Sector recently got the basics for the customization framework in, and in the pictures you can see the soldiers happily posing with some head gear, weapons and custom uniform colors. For launch there will along with this also be various uniform types to further distinguish your soldiers.
Items like this will be available either by collecting them on missions, or you will also be able to buy them in the in game store.