COMPTON — — Growing up, George E. Raley Jr. heard stories that the military had conducted some sort of testing during World War II on the quiet Southern Maryland peninsula known as Newtowne Neck.
As an adult, he would learn that his father had assisted in experiments performed by the Johns Hopkins University Applied Physics Laboratory to develop a weapon credited with helping the Allies win the war in Europe.
So he was not particularly surprised this month when the sands of the peninsula where he once camped, swam and picked blackberries shifted to reveal a small but substantial stockpile of World War II-era munitions.
"Not surprised," Raley said. "But very interested."
Authorities, alerted by a local woman who came across a 57 mm ammunition round while strolling on the beach on New Year's Day, have found 27 pieces of suspected military ordnance along the shoreline of what is now Newtowne Neck State Park.
Military bomb experts have detonated the vintage munitions, and the Army Corps of Engineers is combing land records and military archives to determine how they got here. Meanwhile, the Maryland Park Service has closed Newtowne Neck until further notice.
"From the information we have so far, we do not expect this to be a permanent situation, but we don't know the duration of the closure," Lt. Col. Christopher Bushman, the deputy superintendent of state parks, said Friday. "Public safety is the priority."
The live rounds that are believed to have lain buried here for close to 70 years were only the latest unexploded military ordnance to turn up around the Chesapeake Bay in recent years. From Aberdeen Proving Ground to the Hampton Roads area of Virginia, the region has seen decades of munitions testing.
Pooles Island, a rocky outcropping east of Baltimore that was used from World War I to the 1960s for target practice, has been declared off-limits to the public because of the danger of unexploded ordnance, as has most of the Plum Tree Island National Wildlife Refuge in Virginia.
The surge from Tropical Storm Isabel in 2003 carried bombs and shells ashore. Nautical charts of the bay warn sailors of live depth charges and other munitions still in the water.
Live munitions still are found most commonly in "grandpa's attic," according to Deputy State Fire Marshal Bruce Bouch. But ordnance encountered in or around the water, he said, poses a special risk.
"We have to take it seriously," Bouch said. "They have been underwater, they've been infiltrated with salt water, they're highly unstable. The potential is there for great harm or death."
Bouch said the woman who found the shell on the beach at Newtowne Neck on New Year's Day went home and described it to her husband. They then called 911.
The peninsula, site of the second European settlement in Maryland after St. Mary's City, protrudes into the Potomac River near the Chesapeake Bay. The land was maintained by the Society of Jesus from the 1660s until 1967.
For much of that time, the Jesuits leased it for farming. But during World War II, it was used by the Applied Physics Laboratory in Silver Spring to develop and test the proximity fuse, a top-secret effort that historians have compared to the atomic bomb-building Manhattan Project.
The fuse, intended initially to help the Allies defend against German rockets, caused an artillery shell to detonate as it approached a target. That meant it was no longer necessary to score a direct hit to stop an incoming rocket; close was good enough.
The innovation helped neutralize German V-1 attacks on England and Japanese kamikaze attacks in the Pacific. Eventually used in land warfare, the fuse was credited by Gen. George S. Patton with winning the Battle of the Bulge.
"The VT or radio proximity fuse as finally produced in this country during the war was the greatest invention in artillery since the explosive shell," journalist Lee McCardell wrote in the Sun Magazine in November 1945. "As a secret weapon, it ran second in importance to the atomic bomb only."
When Raley was playing soldiers with friends in the 1950s, his father told him about the proximity fuse. Raley himself had seen the observation towers at Newtowne Neck.
But it wasn't until after his father's death in 2004 that Raley learned that he had been involved in the testing — the family found a 1943 letter from his supervisor at the Applied Physics Laboratory praising his work. George E. Raley Sr. is listed among the project's participants in "The Deadly Fuze: Secret Weapon of World War II," a 1980 book by Hopkins physicist Ralph Belknap Baldwin.
During the tests, 57 mm rounds were fired straight up. The book includes a picture of workers digging up the fallen shells.
The Department of Natural Resources bought Newtowne Neck in 2009 and opened the 776-acre state park. It includes seven miles of shoreline, a boat launch and walking trails.
Responding to the 911 call on New Year's Day, St. Mary's County sheriff's deputies closed the area and contacted the state fire marshal. The fire marshal's bomb squad confirmed that it was a military munition and called the Army Corps of Engineers. The 55th Explosive Ordnance Disposal unit from Fort Belvoir, Va., detonated the shell.
Carl Dubac, whose waterfront property is next to the park, was watching television when he felt the blast. The former Marine Corps test pilot figured an overenthusiastic flier at Naval Air Station Patuxent River nearby had accidentally broken the sound barrier, unleashing a sonic boom.
His wife said she knew it was an explosion.
"It was too loud," Franziska Dubac said. "It was like something exploded not right on top of us, but right next door."
Bouch said bomb-disposal protocol requires that such items be blown up.
"When you're talking about something that old, the potential for instability is paramount," he said. "You don't take them anywhere."
The Dubacs have lived alongside Newtowne Neck for 22 years. They walk and bike through the park. Neither had any idea that ordnance might turn up there.
The fire marshal's office, the state park service and the Corps of Engineers converged on the park, interviewing neighbors and sweeping the shoreline with metal detectors in a search for more munitions.
They have found 27 suspected pieces to date, including 57 mm rounds; 23 have been confirmed to be military ordnance.
When several were found underwater, a team from Naval Surface Warfare Center Indian Head was called to destroy them.
The Corps of Engineers is reviewing real estate records to determine whether Newtowne Neck is a Formerly Used Defense Site — in which case, spokeswoman Andrea Takash said, the agency would take over the effort to find and neutralize the munitions. For now, the Corps of Engineers, fire marshal and park service are working together.
As the research continues, questions appear to outnumber answers.
"We're still trying to ascertain why these were there," Bouch said. "These are World War II-era devices. Obviously, we have to go way back into archives."
If you find suspected ordnance
The Army Corps of Engineers advises people who encounter possible military ordnance to practice The Three R's:
•Recognize that any suspicious objects should not be touched under any circumstances.
•Retreat, or carefully leave the area.
•Report immediately what was found and its approximate location to the police.