Nate, a hearing-impaired student in the JROTC program at Parkville High School in Baltimore County, tries out the Indoor Simulated Marksmanship Trainer with the assistance of his interpreter, Trisha Guy, at Camp Upshur aboard Marine Corps Base Quantico Feb. 4. - Nate, a hearing-impaired student in the JROTC program at Parkville High School in Baltimore County, tries out the Indoor Simulated Marksmanship Trainer with the assistance of his interpreter, Trisha Guy, at Camp Upshur aboard Marine Corps Base Quantico Feb. 4.