The camp, which had been used to train soldiers in espionage and psychological warfare during World War II, now is known as the former Fort Ritchie U.S. Army base.
Much of the documentary was filmed at the former base.
Earlier this month, Weissenbach organized two public screenings of the movie at the fort, which drew hundreds of people from the Washington County area and other states.
"Hollywood works in strange and mysterious ways, and sometimes that does not reflect on the merits of a particular film," Weissenbach said Friday.
Beating out "The Ritchie Boys" for an Oscar nomination were the films "Born into Brothels," "The Story of the Weeping Camel," "Super Size Me," "Tupac: Resurrection" and "Twist of Faith."
Weissenbach questioned some of those choices, in particular "Tupac: Resurrection," about slain gangsta rapper Tupac Shakur, and "Super Size Me," about a man who eats three meals a day for a month at McDonald's.
"How can a movie about a rapper and about going on an eating frenzy at McDonald's beat out a movie like 'The Ritchie Boys'?" Weissenbach said. "Hollywood, I don't think, wanted to go political this year."
Weissenbach said he has received plenty of feedback, including from some of the Ritchie Boys, who told him they were disappointed that the movie didn't make the final list.
"These are the people who are the real heroes of this country ... and they'll always be heroes," he said.
But while Weissenbach said he understands the disappointment, the film was a nice tribute to the Ritchie Boys and will continue to educate and touch people when it eventually is released on DVD.
"This is not the end of the line for the film," Weissenbach said. "The movie will generate a lot of interest."