About Us

Command Group

COL Aaron C. Pitney

Commander, U.S. Army Medical Department Activity
Fort Leonard Wood, Missouri

Colonel Pitney received his commission from the United States Military Academy and his Medical Doctorate from the Uniformed Services University of the Health Sciences.  After medical school, he completed his residency in Pediatrics at Tripler Army Medical Center, Hawaii, and a fellowship in Pediatric Hematology Oncology at the National Capital Region Medical Directorate.  Following his fellowship, he completed six months of post fellowship training in Pediatric Bone Marrow Transplant at Johns Hopkins. Colonel Pitney is certified by the American Board of Pediatrics in General Pediatrics and Pediatric Hematology/Oncology.

Colonel Pitney was assigned as a Staff Pediatric Hematologist-Oncologist at Brooke Army Medical Center from 2003-2007 where he created the first military-civilian joint Institutional Review Board with the University of Texas Health Science Center for Pediatric Oncology Group clinical trials.

From 2007-2010, Colonel Pitney served as the Chief of Pediatric Hematology-Oncology and Assistant Chief of Pediatrics at Tripler Army Medical Center. In 2010, Colonel Pitney was named the Chief of Pediatrics at Madigan Army Medical Center, Joint Base Lewis-McChord, Washington, and served there until the 2015.  He spearheaded the efforts to initiate the Patient Centered Medical Home model in the Department and helped open a Pediatric Pharmacy within the Clinic.

From 2015-2016, Colonel Pitney was the Deputy Commander for Clinical Services and Chief Medical Officer for the 549th Hospital Center/Brian Allgood Army Community Hospital in the Republic of Korea.  Following his assignment in Korea, COL Pitney returned to Joint Base Lewis-McChord where he served as the Deputy and then Chief of Clinical Operations for Regional Health Command-Pacific.

Colonel Pitney’s operational assignments include two deployments in Iraq. In 2003, he deployed as the Battalion Surgeon for the 704th Division Support Battalion, 4th Infantry Division, Camp Speicher, Iraq. In 2010 he served as the Medical Director for the 21st Combat Support Hospital in Mosul, Iraq. He also served as the Joint Task Force Medical Team Leader, Operation Cobra Gold, 2009.

Colonel Aaron Pitney’s most recent assignment was as the Chief of Medical Readiness, Office of the Surgeon General from July 2018 until May 2020.

His military education includes the Army Medical Department Officer Basic Course, the Army Medical Department Officer Advanced Course and the Command and General Staff Officer Course. In addition to his medical doctorate, Colonel Pitney holds a Master’s Degree in Strategic Studies from the U.S. Army War College.

Colonel Pitney’s awards and decorations include the Meritorious Service Medal (with four oak leave clusters), the Army Commendation Medal, the Joint Service Achievement Medal, the Army Achievement Medal (with four oak leave clusters), National Defense Service Medal, the Global War on Terrorism Service Medal, the Iraqi Campaign Medal (with two service stars), the Korea Defense Service Medal, the Joint Meritorious Unit Award, the Meritorious Unit Commendation, the Army Superior Unit Award, and the Parachutist Badge, the Army Staff Badge,. He is the recipient of The Surgeon General’s “A” Designator and is a member of the Order of Military Medical Merit.

CSM John P. Castillo

Command Sergeant Major
Gen. Leonard Wood Army Community Hospital
U.S. Army Medical Department Activity
Fort Leonard Wood, Missouri

CSM John Paul Castillo enlisted in the U.S, Army as a 13B (Cannon Crewmember) and attended One-Station Unit Training at Fort Sill, Oklahoma. CSM Castillo later reclassified to 68S (Preventive Medicine Specialist). Since then, he has served in leadership positions of increasing responsibility to include team leader, squad leader, Platoon Sergeant, Detachment Sergeant, Department Noncommissioned Officer-in-charge, Senior Operations Sergeant, First Sergeant, Chief Medical Noncommissioned Officer (NCO), and Sergeant Major.  He currently serves as the Command Sergeant Major of General Leonard Wood Army Community Hospital.

CSM Castillo is a Class 67 graduate of the United States Army Sergeants Major Academy (USASMA), and he has attended numerous professional military training courses to include the Tactical Combat Casualty Care Course, the Battle Staff Noncommissioned Officer Course, the Health Physics Specialty Course, and the Master Resiliency Trainer Course. CSM Castillo earned placement on the Commandant’s List at every level of the NCO Education System and was a recipient of the 2016 USASMA Military Writing Award from the Association of the United States Army.

CSM Castillo’s awards include the Meritorious Service Medal (9th award), the Army Commendation Medal (13th award), the Army Achievement Medal (12th award), the Meritorious Unit Commendation, the Army Superior Unit Award, the Afghanistan Campaign Medal, the Good Conduct Medal (8th award), the Expert Field Medical Badge, the German Armed Forces Proficiency Badge (Gold), the Norwegian Road March Badge, and the Driver’s Badge (wheeled).  CSM Castillo is a Sergeant Audie Murphy Club inductee and a member of the prestigious Order of Military Medical Merit (O2M3).


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