Commander Giangrasso was born in Trenton. Ascending from the enlisted ranks, as a Fire Control Technician, he was appointed to the Reserve Officer's Training Corps at the University of Florida, where he earned a Bachelor of Science in Building Construction. He was commissioned upon graduation in December 1993.
After completing the Cryptologic Division Officer Course in April 1994, he reported to Naval Security Group Activity Northwest, Virginia, where he served as a Direct Support Officer. His tour at Northwest included service on the following combatants and Staffs: USS INCHON in support of Support Democracy (06 Jul - Aug 94), USS COMTE DE GRASSE in support of Operation Support/Uphold/Maintain Democracy (05 Sep - 03 Oct 94), USS NASHVILLE (27 Nov - 12 Dec 94), COMPHIBRON FOUR as Joint Intelligence Watch Officer onboard USS WASP during NATO Exercise Strong Resolve 95 (31 Jan - 05 Apr 95), COMSECONDFLT embarked USS MT WHITNEY (07 Jul - 24 Jul 95), and COMCRUDESGRU TWO/ Commander George Washington Battle Group for JTG 96-1 as Command and Control Warfare Tactical Cryptologic Officer (14 Aug - 23 Jul 96).
In December 1996, he reported to and later commissioned the first Combat Direction Finding Flight II Arleigh Burke-class destroyer, USS MAHAN as the Signals Warfare Officer. Prior to his departure in July 1999, Commander Giangrasso attained his Surface Warfare Officer qualification.
In July 1999, Commander Giangrasso reported to the Naval Postgraduate School in Monterey CA, where he earned a Master of Science Degree in Systems Engineering (Information Warfare). His thesis work was focused on modeling media influences in Information Operations.
Upon graduation in October 2001, Commander Giangrasso reported to Naval Security Group Headquarters. As a Staff Action Officer, his assignments included Information Operations Action Officer (AO), development and implementation of the Cryptologic Community's Computer Network Operations processes and policies, Surface Operations AO and Assessments Department Head.
From November 2004 to December 2005, he was responsible for operations and requirements management for all airborne, surface, subsurface and land-based intelligence collections assets as the Collection Manager for U.S. Naval Forces Central Command, Commander 5th Fleet and Combined Force Maritime Component Command Bahrain. Following his tour in Bahrain, Commander Giangrasso was appointed as Executive Officer for Navy Information Operations Command, Colorado.
Commander Giangrasso reported to Cryptologic Services Group (CSG) U.S. Central Command in February 2007 where he deployed to Afghanistan as the CJTF-101/82 CSG Officer-in-Charge (OIC). As Chief of CSG CENTCOM, he was responsible for over 370 national deployers to the CENTCOM AOR, developed and implemented Digital Network Intelligence training standards and sponsorship processes for all deployers to the CENTCOM AOR and developed the Analytic Mission Management tool concept, which was endorsed and funded for development by the National Security Agency.
He reported as the Cyberspace Operations Assessments Section Head on the OPNAV N81F Information Dominance Branch Staff in May 2010.
Commander Giangrasso's personal awards include the Defense Meritorious Service Medal (second award), the Meritorious Service Medal, the Navy Commendation Medal (second award) and the Navy Achievement Medal (second award).
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