A 40-minute promo reel of the first feature about the Vietnam War actually made in Vietnam will unspool during the Cannes Film Festival.Norwegian sales outfit BV Intl. Pictures will show excerpts of Jonathan Foo and Ngyuen Phan Quang Binh’s “Song of the Stork,” about five North Vietnamese soldiers. Previous Vietnam war epics, including Oliver Stone’s “Heaven and Earth,” Francis Ford Coppola’s “Apocalypse Now” and Stanley Kubrick’s “Full Metal Jacket,” were filmed in Thailand or the Philippines. “Song of the Stork” is also the first Singaporian-Vietnamese co-production from Singapore’s MegaMedia. BV Intl. Pictures represents the film worldwide.