He has not served as an Infantry Officer since 2008, and his career was moving towards a different path. He has worked as a Foreign Area Officer, Pentagon, and National Security Council. An axed to grind for not making Colonel? I do not believe this is the case because: A Lieutenant Colonel who has served a minimum of eighteen years time in service and five years time in grade becomes eligible for promotion to Colonel, provided such officers continue to meet the physical requirements and stay out of legal trouble; although, soldiers seeking the Colonel rank do not usually see achievement of that end until around twenty to twenty-two years of service. https://www.military-ranks.org/army/promotion-to-colonel LtCol Vindman has 20 years of service and was promoted to his current rank in 2015. Based on the above information, he is not eligible for promotion until September 2020.