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Electronics Technician 3rd Class Codie Flanagan and Electronics Technician 2nd Class Anthony Juarez, assigned to Naval Mobile Construction Battalion (NMCB) 1, adjust frequency codes on a GRC-234 high-frequency base station at Naval Base Guam July 27, 2017. These tests give NMCB 1 Sailors the opportunity to perform quality assurance checks on their system’s maximum range and communication quality with Port Hueneme, Calif. NMCB 1 provides expeditionary construction and engineering support to expeditionary bases and responds to humanitarian assistance disaster relief requests.