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John Chargualaf began their work experience as an Engineering Draftsman in 1999 with Chargualaf & Associates, where they produced full working plans for structural designs. John also served as the General Manager, overseeing operations and ensuring timely completion of projects. From 2005 to 2017, they worked as a Design Engineer for Guam Cable Vision, LLC. and DOCOMO PACIFIC, creating and updating accurate drawings and assisting with designs for cable layouts and building floorplans. In 2011, they joined the Guam Army National Guard, initially serving as a Signal Support Specialist, responsible for installing, operating, and maintaining communication equipment. Later, they became a Telecommunications Specialist, serving until 2021. Since September 2021, John has been working as an Engineer Tech III at NASA, contributing to their projects and operations. Additionally, they worked as an IT Specialist at VSolvit starting from 2017.

John Chargualaf received their High School Diploma from George Washington High School, where they studied from 1996 to 1998. Following that, they attended Notre Dame de Namur University in 1998-1999, although no specific degree or field of study is mentioned. In terms of additional certifications, John obtained the Security Plus certification from CompTIA in October 2018. No further information is provided regarding any other educational experiences or qualifications.