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"ETSSN." (n.d.). Fullformexpand.com. Retrieved February 21, 2026, from https://www.fullformexpand.com/etssn/electronics-technician-sonar-seaman.
ETSSN. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/etssn/electronics-technician-sonar-seaman (Accessed: 21 February 2026).