At Fort Meade, the watershed event for security was not the Fort Hood shootings, but the attacks in 2001, spokeswoman Mary Doyle said. She said the Anne Arundel County Army base did not change its security measures in response to Fort Hood.
Before terrorists crashed planes into the World Trade Center and the Pentagon, Meade was an open base. Motorists were not stopped as they drove through the gates; some used the base as a shortcut between Routes 32 and 175. That changed on Sept. 12.
The attacks "taught us we have to stay vigilant, to report suspicious activity and to be alert at all times," Doyle said. "Like most organizations, we have had active shooter training and annually review what we to do and how to protect yourself."
Chris Grollnek, founder of Countermeasure Consulting Group, said some installations have made more progress on security than others. The Texas-based group has trained private contractors who staff post entries.
"It's not a one-size-fits-all," Grollnek said.
Grollnek said the Army has been proactive in training personnel to deal with on-base shootings. But, he said, trying to prevent incidents before they take place can be tricky because it's usually impossible to identify suspects in advance.
"They're black, they're white, they're men, they're women — no one knows what the profile is," he said.
In the minutes following the shootings on Monday, officials at area installations tightened security.
Fort McNair and Joint Base Anacostia-Bolling, both in the District of Columbia, followed the example of the Washington Navy Yard and ordered personnel to shelter in place.
Fort Meade, Walter Reed National Military Medical Center and the Pentagon also increased security.
Col. Brian P. Foley, the commander of Fort Meade, said he decided to increase gate security out of an "abundance of caution," not because of any specific threat.
"As the events at the Navy Yard unfold, we will remain focused on the safety and security of everyone on Fort Meade," Foley said. "We ask that everyone remain vigilant and report any suspicious activity to local authorities."
A spokeswoman for Walter Reed in Bethesda said the facility had increased security under the direction of Naval District Washington, the command that oversees Navy installations in the area.
"The Naval Academy is aware and monitoring the current situation at the Washington Navy Yard," spokeswoman Jenny Erickson said. "We are taking all of the appropriate measures to ensure the continued safety and security of our midshipmen, faculty, staff and our visitors."