Esther Aguigui began her military career in 1985, enlisting in the United States Air Force Reserve as an administrative specialist. She served in the Air Force Reserve until 1997 when she transferred to the Guam Air National Guard to become the first female First Sergeant in Guam's history. In 2000 she was direct commissioned as a 2nd Lieutenant in the Guam Army National Guard and became an Adjutant General officer. From 2006-2007 Aguigui was deployed to Afghanistan as a counterintelligence officer. She was also deployed to assist with the Hurricane Katrina response in 2006. From there, Aguigui then became the first female officer to command a battalion level unit in the Guam National Guard when she commanded the Recruiting and Retention Battalion from 2014-2016. She then became the first female from the Guam National Guard to attend and graduate the resident course of the U.S. Army War College at Carlisle Barracks, Pennsylvania.
Adjutant General
On January 27th, 2019, Guam Governor Lou Leon Guerrero nominated Lieutenant Colonel Esther Aguigui to be the next Adjutant General of Guam, replacing Brigadier General Roderick R. Leon Guerrero who had been serving as Adjutant General since 2015. The appointment was met with controversy as to whether or not Aguigui met the qualifications and rank to take command of the Guam National Guard, and due to a letter of reprimand issued to her by the outgoing Adjutant General. The reprimand was later found to have been inappropriately issued. However her rank caused Brigadier General Diron J. Cruz, the current Assistant Adjutant General to resign to avoid being subordinate to a lower ranking officer. To address this issue, the Guam Government state that Adjutant General is a position and not a rank. While awaiting formal approval by the Guam Legislature, Aguigui was promoted to the state-level rank of Colonel on March 15, 2019 by Governor Guerrero. Her federal recognition as a Colonel is pending, due to undisclosed reasons despite a personal appeal from the Governor of Guam. Aguigui was unanimously approved by the Guam Legislature as the Adjutant General on April 16th, 2019. Governor Guerrero promoted Aguigui to the rank of Major General of the Guam Militia on May 5th, 2019. Her promotion has proven controversial as Guam law states that "No person shall be a member of the Guam Militia while a federally recognized member of the National Guard, or any active or reserve military organization." and Major General Agugui continues to hold a federally recognized rank of Lieutenant Colonel. Aguigui has also received criticism for her staff picks and leadership from members of the Guam National Guard in letters sent to the Governor of Guam.
