Someone in the group laughed after a group photo, causing the reaction.
"We don't often get stones back, in this area when I was a boy, people would take the stones home, use them for landscaping or bookends."
Olivewood Cemetery is Houston history, many of the souls buried there lived through slavery going on to help build Houston after Emancipation.
One mother fought back her emotions as she spoke with us, and as she talked to others about her son, Jonathan. He died while serving in Afghanistan in 2008.
Ceremonies were held around the Bay Area including San Bruno, Walnut Creek and San Jose to commemorate fallen veterans this Memorial Day.
"It's an opportunity to upload videos, photos, stories. People can visit and leave messages, and not visit physically, but can visit virtually," said Patten Monument Group President Andrew Bolt.