CDR Monagle was born in Athens, Georgia. He attended Indiana University in Bloomington, IN, where he received a Bachelor of Science degree in Applied Science. He earned his Masters of Science degree in Management from University of Maryland University College.
Following initial flight training and designation as a Naval Aviator, CDR Monagle transferred to HMT-302 in New River, North Carolina for training in the MH-53E helicopter.
His first fleet tour was with the "Vanguard" of HM-14 in 2001. He qualified as AMCM Mission Commander and functional check pilot. He deployed to Bahrain as a co-pilot and as the detachment Administration Officer while attached to Vanguard. His later deployments included operations ENDURING FREEDOM and IRAQI FREEDOM.
Following HM-14, he was selected as a Fleet Replacement Squadron (FRS) instructor pilot at the Airborne Mine Countermeasures Weapons Systems Training School (AWSTS) where he also served as Commander, Naval Air Force MH-53E NATOPS Evaluator. In 2007, CDR Monagle reported aboard USS THEODORE ROOSEVELT (CVN 71) where he served as a “shooter” and as the Catapult and Arresting Gear Officer (V2 Division Officer). With the ROOSEVELT Strike Group, he deployed to the Central Command area of responsibility in support of Operation ENDURING FREEDOM.
In 2009, CDR Monagle again joined the "Vanguard" family as the Officer-in-Charge of the detachment in Pohang, Republic of Korea, and served as the Safety Officer and eventually as the Aircraft Maintenance Officer.
In 2011, CDR Monagle reported aboard Naval Air Systems Command as the Assistant Program Manager Systems Engineering in support of PMA-261 (Heavy Lift Helicopters).
In August of 2014, he reported aboard the “Blackhawks” of HM-15 as the Executive Officer.