Authorities say the 28-year-olds went around the country this year correcting punctuation and other errors on government and private signs. They took things a little too far when they defaced a decades-old, handpainted historical marker at the Grand Canyon.
The National Park Service says investigators heard about the vandalism from the Typo Eradication Advancement League Web site, which was operated by one of the men.
The two have now pleaded guilty to conspiracy to vandalize government property. They were sentenced to a year's probation and are banned from national parks during that time. They were also ordered to pay more than $3,000 to repair the Grand Canyon sign.