Donald Agbayani was a 24th century Human male, an engineering officer in Starfleet who served as the chief engineer on the Federation starship USS Mercury in 2376. Working in tandem with Science Officer Alfonzo, the two officers were known as "Double A". (TNG novel: Doors Into Chaos)

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USS Mercury personnel
Ufp-emblem D. AgbayaniAlfonzoC. Brisbayne Starfleet Command logo

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