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Nationally, the National Law Enforcement Memorial Fund reports that officer fatalities by firearm are up this year. As of Dec. 21, there were 65 officers killed in the line of duty compared to 59 killed in the line of duty by firearm last year.

In response to the possibility that officers in the District will come under fire, Mr. Baumann said specialized training at the department’s shooting range has proved beneficial.

“They’ve done a really good job responding to those increases and making officers think about taking cover,” Mr. Baumann said, adding that instructors re-enact real life scenarios that officers have faced on D.C. streets.

But departmental shootings often raise concern in the communities in which they occur, as did the fatal shooting of a mentally ill man in the District’s Mount Pleasant neighborhood in Northwest this summer. Officers fatally shot 55-year-old Jean E. Louis after the man barricaded himself in a bathroom in his home and later attacked an officer with a screw driver.

Both Prince George’s County and the District in their recent histories have faced federal oversight after questions about their police departments’ use of force. Prince George’s County was under the oversight of the Department of Justice from 2004 to 2008 after a series of officer shootings and in-custody deaths.

D.C. police in 2001 entered into a memorandum of understanding with the Justice Department governing the use and display of force. The agreement ended in April 2008 after the department made substantial changes to the way it reports and investigates the use of force.

Arthur Spitzer, legal director of the ACLU of the Nation’s Capital, said officer-involved incidents are always troubling.

“We’re always concerned with police shootings,” he said. “The good news, at least in D.C., is D.C. police instituted a pretty good system of investigations every time there is a shooting by police.”