WALLA WALLA, Wash. –The Walla Walla District, U.S. Army Corps of Engineers will host an Industry Day on Oct. 23, 2015 from 9 a.m. to 4:30 p.m. at the District Headquarters, 201 North Third Avenue, Walla Walla, Wash. This event is a free seminar for business owners and representatives focused on how to secure business with the Corps.