Security Guard Service Visalia, Tulare, Fresno, Porterville, Dinuba, Hanford, Lemoore, Lindsay. Fresno, Kings, Tulare County. Citadel Blue Security Services was founded in 2015. While working for the largest Security Guard firm in the the United States he realized there was a growing need for honest, dedicated and trained Security Officers. It was this seed that spawned Citadel Blue Security Services.