Sim, refere-se a uma pessoa, Zachary "Zack" Mayo (interpretada por Gere). Como a Wikipédia explica :
The film's title uses an old expression from the British Royal Navy and subsequently from the U.S. Uniform Code of Military Justice, as being charged with "conduct unbecoming an officer and a gentleman" (from 1860).
Matthew Sharpe explica isso assim :
At the conclusion of the film (in fulfilment of what is intimated in the title) Mayo defies the odds to become an officer. Equally, he honours the love of the faithful Paula, thereby proving himself a gentleman.