You can find the specifics for this issue in AR 600-8-19. Forcing someone to change a rating is unacceptable unless that rating is not fair or not in compliance with regulatory requirements. However, the Squad leader needs to have an open mind in this matter. I would encourage the Squad leader to look at this from the senior leader’s perspective so that the Squad leader can arrive at an objective decision based on the facts. When the Squad leader does this the leaders usually do not have any room to move because he was objective in his analysis of the issue.