Brigadier General William Souza enlisted and entered boot camp in 1984 and completed his enlistment in 1988 with the 2nd Marine Air Wing, after which he joined the Marine Corps Reserves and attended college with the intent of gaining commission.
Commissioned in 1993, Brigadier General Souza was assigned as a Platoon Commander at Marine Corps Base, Camp Pendleton.
He left active duty in 1996 and went to work for Intel Corporation. During this time, he joined the Marine Corps Reserve and served two tours as a Company Commander within 4th Marine Division.
In 2003, Brigadier General Souza served a short tour in the Philippines with III Marine Expeditionary Forces.
In 2004, Brigadier General Souza was augmented to the Coalition Military Advisory Training Team in Iraq. Upon his return, he served as a Battalion Executive Office with 4th Landing Support Battalion until he attended the resident Top Level School course at the Naval War College.
Brigadier General Souza subsequently deployed to Afghanistan with US Army Special Operations Command until 2011 and took command of a Battalion within 4th Marine Division.
Relinquishing command in 2013, he transferred to the Division as the AC/S G-3.
Brigadier General Souza was selected for command as the Senior Reserve Advisor (Deputy) for 23rd Marines and assumed those duties in June 2017, and subsequently assigned as Commander 25th Marines from January through July 2018. Upon completion of these duties, Brigadier General Souza returned to his duties as Deputy of 23rd Marines.
In April of 2019, Brigadier General Souza assumed the duties as Deputy Commander, Marine Forces Reserve and Marine Forces North. Brigadier General Souza currently serves as the Deputy Commander, Mobilization for U.S. Marine Corps Forces Command in Norfolk, Virginia.
Brigadier General Souza is a graduate of Central Washington University, and holds a BA Degree in History. He is a graduate of Amphibious Warfare School and the Command and Staff College DEP also attaining a MA degree in National Security and Strategic Studies from the Naval War College.