Junction Highway #72. Photo highway # 72 highway sign West to communities of Calliham, Texas, Tilden, Texas. North to city of San Antonio, Texas. West access via highway #72 to Choke Canyon State Park Campground ( south Shore Unit )& Canyon State Park Campground ( Calliham Unit ) Texas Tropical Trail (The Old Military Highway) Highway 281 as well as being called "The old Military Highway", and is part of the "Texas Tropical Trail" the highway is also part of "The Great Texas Birding Trail"