In Nigeria, the Nigerian military is sub-Saharan Africa’s largest and regarded as one of its most capable forces; the military's primary concerns are internal and maritime security, and it faces a number of challenges; the Army is deployed in all 36 of the country's states; in the northeast, it is conducting counterinsurgency/counterterrorist operations against the Boko Haram (BH) and Islamic State of Iraq and ash-Sham in West Africa (ISIS-WA) terrorist groups, where it has deployed as many as 70,000 troops at times and jihadist-related violence has killed an estimated 35-40,000 people, mostly civilians, since 2009; in the northwest, it faces threats from criminal gangs--locally referred to as bandits--and violence associated with long-standing farmer-herder conflicts, as well as BH and ISIS-WA terrorists; bandits in northwestern Nigeria are estimated to number as many as 30,000 and violence there has killed approximately 14,000 people since the mid-2010s; the military also continues to protect the oil industry in the Niger Delta region against militants and criminal activity; since 2021, additional troops and security forces have been deployed to eastern Nigeria to quell renewed agitation for a state of Biafra (Biafra seceded from Nigeria in the late 1960s, sparking a civil war that caused more than 1 million deaths)

the Navy is focused on maritime security in the Gulf of Guinea; since 2016, it has developed a maritime strategy, boosted naval training and its naval presence in the Gulf, increased participation in regional maritime security efforts, and acquired a number of new naval platforms, including offshore and coastal patrol craft, fast attack boats, and air assets

the Nigerian military traces its origins to the Nigeria Regiment of the West African Frontier Force (WAFF), a multi-regiment force formed by the British colonial office in 1900 to garrison the West African colonies of Nigeria (Lagos and the protectorates of Northern and Southern Nigeria), Gold Coast, Sierra Leone, and Gambia; the WAFF served with distinction in both East and West Africa during World War I; in 1928, it received royal recognition and was re-named the Royal West African Frontier Force (RWAFF); the RWAFF went on to serve in World War II as part of the British 81st and 82nd (West African) divisions in the East Africa and Burma campaigns; in 1956, the Nigeria Regiment of the RWAFF was renamed the Nigerian Military Forces (NMF) and in 1958, the colonial government of Nigeria took over control of the NMF from the British War Office; the Nigerian Armed Forces were established following independence in 1960 (2024)