Recent Examples on the WebIn the United States Army, Colonel is the most senior field grade military officer and just below the rank of Brigadier General.courant.com, 17 May 2021 Later, at the big bases far from the action, surrounded by gyms and chow halls and the expeditionary office park where the flag and field grade officers did their work, it was replaced by a cologne of machinery and order. Timothy Kudo, Star Tribune, 15 Apr. 2021