The U.S. Army’s 308th Calvary trained on land that now houses O’Hara Community Park. The land, in a nine-parcel estate that totaled 1,923 acres, was later owned by U.S. Senator James Ross. A picnic …The U.S. Army’s 308th Calvary trained on land that now houses O’Hara Community Park. The land, in a nine-parcel estate that totaled 1,923 acres, was later owned by U.S. Senator James Ross. A picnic …