Acme Army is a term that does not commonly have synonyms. It typically refers to a group or organization that is considered to be at the highest level of achievement or success, often in a military or business context. However, some synonyms that may be used include elite forces, top-ranking troops, or highly successful organization. These all convey the idea of a group or organization that is the best at what they do. Other possible synonyms for "acme army" could include top-tier forces, cream of the crop organization, or superior army. Regardless of the specific synonym used, the meaning behind the term remains the same - a group that is considered to be at the pinnacle of achievement.