Like potato without soil, Comrade can not grow without recognition from State. Work hard and prove yourself and you will be rewarded with "non-arbitrary" Rank. As your Communist State grows so too will your Rank; accompanied with crisp new uniforms to show off your status.
Complete Missions to earn new Ranks. When you are ready, accept promotion and be sent to new neighbouring country where you will start to spread the glory of Communism once more from beginning with benefit of the Researchers you earned in last Rank.