File photo shows Princess Diana walk in one of the safety corridors of the landmine field in Huanbo, Angola, January 15, 1997 during a visit to help a Red Cross campaign outlaw landmines worldwide. Credit: Reuters/Jose Manuel Ribeiro
Britain's Prince Harry (2nd L) speaks with HALO Trust CEO Guy Willoughby (L), HALO provincial manager Tony Jose Antonio (C), and HALO senior managers Colin Watson and Gerhard Zank (R), as they discuss clearance techniques of a Russian TM57 anti-tank mine, in Angola, in this undated handout photograph released in London August 18, 2013. (REUTERS)
Britain's Prince Harry (L) is shown around a current clearance site in Angola by HALO provincial manager Tony Jose Antonio, in this undated handout photograph released in London August 18, 2013. (REUTERS)
Britain's Prince Harry (R) and HALO Director Guy Willougby stand next to a South African Olifant tank destroyed in the battle for Cuito Cuanavale in 1988, in Angola, in this undated handout photograph released in London August 18, 2013. (REUTERS)
Britain's Prince Harry (R) discusses future mine clearance priorities with HALO senior manager Gerhard Zank (L), deminer Mateus Canhanga (2nd L) and section leader Maria Ilda da Piedadeis, in Angola, in this undated handout photograph released in London August 18, 2013. (REUTERS)