Main Characters Chyler Silva 5 main appearances April Orenski 5 main appearances Michael "Sully" Sullivan 5 main appearances Thomas Lasky 5 main appearances Vickers 4 main appearances JJ Chen 4 main appearances Colonel Mehaffey 3 main appearances Dimah Tchakova 3 main appearances Master Chief Petty Officer John-117 2 main appearances General Black 2 main appearances