ADR3 stands for Aviation Machinist's Mate (reciprocating Eng Mech) Petty Officer 3rd Class.
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Fullformexpand.com, 2026. "ADR3." Accessed August 23, 2026. https://www.fullformexpand.com/adr3/aviation-machinists-mate-reciprocating-eng-mech-petty-officer-3rd-class.
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ADR3. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/adr3/aviation-machinists-mate-reciprocating-eng-mech-petty-officer-3rd-class (Accessed: 23 August 2026).
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