Establishment of Nigeria Police Force
Section 214(2)(c) · 1999 Constitution (2004 edition)
What Constitution says
(c) the National Assembly may make provisions for branches of the Nigeria Police Force forming part of the armed forces of the Federation or for the protection of harbours, waterways, railways and air fields.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 95–96. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections