The immediate postcolonial moment brought both promise and peril for the states of Africa and their security. The process of decolonization generated instability, and the emergent Cold War caught up the still-fragile independent states in a global ideological struggle between superpowers. While the political story of these states has been written in detail, the story of their militaries has been largely inaccessible, leaving only sketches of the coups, mutinies, and overall failures of security that outside observers could chronicle. Ujamaa’s Army traces the evolution of the Tanzania People’s Defence Force from its inception in 1964 following the broader East African uprisings to its fully realized form on the eve of Tanzania’s 1978 conflict with Uganda. The book gathers primary interviews with key military actors within Tanzania and interweaves their narratives with archival sources to produce a detailed history of the culmination of President Julius Nyerere’s ideological project and the military leadership’s vision of a professional and effective force for guarding the nation and supporting liberation struggles across Southern Africa.