Armed soldiers jumping from a helicopters during the <a href="https://en.wikipedia.org/wiki/Guerra_do_Ultramar" class="extiw" title="en:Guerra do Ultramar">Portuguese Colonial War</a>. Label on original image said "Assalto na Mata da Sanga..." (Assault on Mata da Sanga - a place name).
Joaquim Coelho
File provided by Joaquim Coelho, <a rel="nofollow" class="external text" href="https://espacoetereo.no.sapo.pt/">Espaço Etéreo</a>