Despite a 2002 promise from President Bush to put citizenship applications for immigrant members of the military on a fast track, some are finding themselves waiting months, or even years, because of bureaucratic backlogs. One, Sgt. Kendell K. Frederick of the Army, who had tried three times to file for citizenship, was killed by a roadside bomb in Iraq as he returned from submitting fingerprints for his application.

About 7,200 service members or people who have been recently discharged have citizenship applications pending, but neither the Department of Defense nor Citizenship and Immigration Services keeps track of how long they have been waiting. Immigration lawyers and politicians say they have received a significant number of complaints about delays because of background checks, misplaced paperwork, confusion about deployments and other problems.

“I’ve pretty much given up on finding out where my paperwork is, what’s gone wrong, what happened to it,” said Abdool Habibullah, 27, a Guyanese immigrant who first applied for citizenship in 2005 upon returning from a tour in Iraq and was honorably discharged from the Marines as a sergeant. “If what I’ve done for this country isn’t enough for me to be a citizen, then I don’t know what is.”

The long waits are part of a broader problem plaguing the immigration service, which was flooded with 2.5 million applications for citizenship and visas last summer  twice as many as the previous year  in the face of 66 percent fee increases that took effect July 30. Officials have estimated that it will take an average of 18 months to process citizenship applications from legal immigrants through 2010, up from seven months last year.