Shavetail

A shavetail is a slang term, primarily used in military contexts, for a newly commissioned officer, particularly one who is inexperienced or naive. The term is considered informal and can sometimes carry a mildly derogatory connotation, implying a lack of practical knowledge or leadership skills.

The etymology of "shavetail" is debated, but the most common explanation traces it to the appearance of mules used in the army. New mules would have their tails shaved as an indication of their inexperience. Newly minted officers, similarly lacking experience, were therefore likened to these mules. Another proposed, less common, etymology suggests it referred to the single tail coat worn by second lieutenants, the lowest rank of commissioned officers.

The term is most frequently encountered in the United States military, particularly in branches with a strong tradition of informal jargon. While less common in modern usage due to increased emphasis on officer training and professionalism, the term persists as a reminder of the learning curve faced by new officers and the importance of experience gained in the field. It is typically used by enlisted personnel and senior officers to refer to junior officers. The usage is typically lighthearted, though the context can influence its tone.