These are the career websites of the Nigerian Armed Forces and other security parastatals You can register yourself with them where required and watch out for vacancies.
Nigerian Air Force (http://careers.nigerianairforce.gov.ng/)Careers
Nigerian Navy (http://www.nigeriannavy.gov.ng/OfficerSelection.aspx) Recruitment
The Nigeria Police - Jobs & Careers (http://recruitment.npf.gov.ng/ %20%5Burl=http://www.npf.gov.ng/index.php?meat=7)]Nigerian Police[/url]
Nigerian Army and SSS (http://www.nigerianarmyms.org/index.php) e-Recruitment
Nigerian Customs Service (http://www.customs.gov.ng/jobs/joblistings.php) Job Listings