It started with something as simple as a military Mussette bag.Eric Porter was only 16 when he acquired the bag, a popular World War II alternative to a haversack. About 20 years have passed, and Porter’s collection of military antiques has only grown. Now his garage in Sherwood, Ore., is filled with the antiques.“My wife has never been able to park in the garage,” joked Porter, 36.Porter is an organizer with Living History Group Northwest, which is conducting a World War II encampment from 9 a.m. to 5 p.m. Saturday at the Pearson Air Museum in Vancouver. Many war-era artifacts will be on display.All the items are from 1942 to 1945, and there will be plenty of group members on hand, dressed in WWII-era gear, to explain just how those antiques factored into battle. There will be a U.S. Marine Corps display, multiple tents showcasing nursing, communication and logistical stations, plus vehicles, guns and much more.“A lot of veterans love seeing this stuff,” Porter said. “It’s different to see it in a book, but to see it, touch it, smell it. It’s different in real life.”Porter drove his 1942 Ford GPW from Sherwood. He spent more than four years restoring the jeep-type vehicle, stripping it down before rebuilding it.His father, Corky, who will be a company clerk and a truck driver at the encampment, served in Vietnam for a portion of his 28 years in the military — 26 years in the Navy, and two in the Army. Porter, who has participated in the Clark County encampment three times now, said throwing these events with his father has brought the pair closer. It also presented a bonding experience for Porter and his sons Noah, 10, and Andrew, 6.