June 24, 1981: President Daniel Arap Moi officially opens the 18th Assembly of African Heads of State and Government at Kenyatta International Conference Centre, Nairobi, shortly after being installed as Chairman of the Organisation of African Unity (OAU) for 1981–82. In his address, he called for greater African unity and urged leaders to focus more on continental issues. Seen here with President Siaka Stevens of Sierra Leone, the outgoing OAU Chairman.