Compulsory military service
Section 220(2) · 1999 Constitution (2004 edition)
What Constitution says
(2) Until an Act of the National Assembly is made in that behalf the President may maintain adequate facilities in any secondary or post-secondary educational institution in Nigeria for giving military training in any such institution which desires to have the training. D - Political Parties
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 98. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections