National flaps are different from regular lodge flaps in that they are worn by arrowmen from lodges all across the country. Issued by the National Executive Secretary of the National Committee of the Order of the Arrow, these flaps are only worn by an individual while serving in the capacity indicated by the flap and have traditionally been restricted to two per person.
National flaps have been issued for members of the National Committee, and the OA Service Corps for the 1977, 1981, 1985, 1989, 1993, 1997, 2001, 2005, 2010, 2013, and 2017 National Jamborees (Miura).
Also, in 2019 the National Council created Wewikit Lodge, mainly for professionals and the National Chief and National Vice-Chief. Volunteers and professionals attending the National Planning Meeting in December were each given a flap badge from this lodge (Minnihan and Shelley). According to patchscan.com, 350 were manufactured by Moritz Embroidery in July of that year. In my opinion, these are more akin to the discontinued National Committee flaps.
The OA has provided service troops since the 1950 National Jamboree. These early troops were issued armbands instead of flaps at the 1950, 1953, 1957, 1960, 1964, and 1973 Jamborees (Aldridge).