The son of South American immigrants and naturalized citizens, Colonel Miagany was born in Connecticut and raised in California. He received his commission as a Second Lieutenant from the U.S. Naval Academy in May 1994.
Following his training at The Basic School and the Field Artillery Officer Basic Course, 2ndLt Miagany reported to Battery L, 3d Battalion, 12th Marines for duty. He served in Okinawa, Japan from 1995 to 1998 with Battery L, the 31st Marine Expeditionary Unit HQ and HQ Battery, 3d Battalion, 12th Marines. His billets included Forward Observer, Target Info Officer, Assistant Executive Officer (XO)/Platoon Commander, Battery XO, Battalion Fire Direction Officer & Assistant Battalion S-3 Officer. He was promoted to First Lieutenant in 1996 and to Captain in 1998.
From 1998 to 2000, Captain Miagany was stationed at Marine Corps Recruit Depot Parris Island, SC as Series Commander, H Company, Second Recruit Training Battalion and as Commanding Officer, Instructional Training Company, Support Battalion. He returned to Fort Sill in 2001 to attend the Field Artillery Captains Career Course. He then reported to 10th Marines in Camp Lejeune, NC for duty as the commander of Battery S, 5th Battalion, 10th Marines. In 2002 he served as Aide-de-Camp to the CG of 2d Marine Division and deployed in support of (ISO) Operation ENDURING FREEDOM for the standup of Combined Joint Task Force - Horn of Africa. Captain Miagany finished his FMF tour as the Battalion S-4 Officer for 5th Battalion, 10th Marines in 2004.
From 2004 to 2007, he was assigned to the Marine Corps Air Ground Combat Center in 29 Palms, CA where he served as Fire Support Representative (Coyote 22) for the Tactical Training Exercise Control Group. He deployed ISO Operation IRAQI FREEDOM and worked with Iraqi Security Forces for 1st Marine Division in Al-Anbar Province. He was promoted in theater to the rank of Major and upon his return, he continued to serve as Coyote 22 supporting service level training for deploying Marine Corps units until 2007.
Maj Miagany attended Air Command & Staff College in Maxwell Air Force Base where he received a Masters of Military Operational Art & Science. Following this he served as the Crisis Action Team XO, United Nations Command/Combined Forces Command/ U.S. Forces Korea until 2010. Upon selection for command, he was frocked to the rank of Lieutenant Colonel and he commanded 3d Battalion, 12th Marines in Okinawa, Japan until 2012. During this timeframe, 3/12 completed nine off island live fire training exercises and eight UDP firing battery rotations in support of 3d Marine Division and III Marine Expeditionary Force. He departed Okinawa to attend the U.S. Naval War College in 2012.
In 2013, LtCol Miagany graduated from the College of Naval Warfare, U.S. Naval War College in Newport, RI receiving a Masters in National Security and Strategic Studies. He then reported to HQMC Programs & Resources for duty as a resource strategy analyst within the Program Analysis & Evaluation branch. While assigned to HQMC, LtCol Miagany deployed to Iraq and served with Combined Force Land Component Command – Iraq in support of Operation INHERENT RESOLVE.
In 2015, LtCol Miagany reported to Allied Joint Forces Command Naples for duty as an exercise planner in support of the NATO Response Force mission. Following his selection and frocking to Colonel, he transferred to U.S. Naval Forces Europe/Africa and U.S. Sixth Fleet for duty as Director N35 FUOPS and as Fleet Marine Officer (FMO). During his tour he supported amphibious operations planning for multiple MEU rotations in the EUCOM and AFRICOM areas of responsibility. Colonel Miagany assumed command of 11th Marines on 11 July 2018.
His decorations include: the Legion of Merit, Bronze Star, Purple Heart, Defense Meritorious Service Medal with bronze oak leaf, Meritorious Service Medal with gold star, Joint Service Commendation Medal, Navy Commendation Medal with gold star, and the Combat Action Ribbon.