About 20 Manning supporters demonstrated in the rain outside the visitor gate at Fort Meade.
The first part of Pte Manning's trial began on 16 December 2011 at Fort Meade, Maryland.
CNN's Larry Shaughnessy contributed to this report from Fort Meade and Michael Martinez from Los Angeles.
Larry Shaughnessy reported from Fort Meade and Mark Morgenstein wrote this report in Atlanta.
Officials say Fort Meade was chosen because its military court is one of the largest in the Washington area.
Northrop Grumman is the largest employer in Anne Arundel County, where the state capital and the Army's Fort Meade also are located.
At the start of the four-day pre-trial hearing in Fort Meade, Maryland, Judge Denise Lind ruled that Pfc Manning's confinement was "more rigorous than necessary".
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Last month, a military judge at a pre-trial hearing in Fort Meade, Maryland, ruled Pte Manning would have 112 days taken off his sentence if he is convicted.
Within months after taking office, President Obama established an executive-branch cybersecurity coordinator and a new Cyber Command colocated with the super-secret National Security Agency at Fort Meade, MD.
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Lisa Carlson of Fort Meade, Maryland, first heard about it on the morning news, and was preparing to explain it to her panda-loving, 5-year-old daughter Amber during their family visit to the zoo Sunday.
Pte Manning, who appeared at the hearing at Fort Meade in Maryland, was born in Oklahoma and spent almost four years at Tasker Milward Comprehensive School in Haverfordwest, and his Welsh mother Susan still lives in Pembrokeshire.
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