u/PracticalCobbler8620

I've been going through and S-ranking all my missions, and I cannot for the life of me get S-rank on "Supply Base Construction". The problem is, I'm unable to set up all 4 bases before the mission fails. I set the 3rd up and suddenly it's telling me I've failed. No matter how I change my approach and strategy, I am unable to do all 4. Is there some secret life hack to the mission that I'm missing? Please help, I am going crazy.