By "El Huaso" for Borderland Beat A Mexican Navy Pilatus PC-7 flying over Rosario, Sinaloa, 7 July. Ten Chapitos gunmen were killed by Mexican security forces southern Sinaloa in an operation responding to an IED attack against a Navy patrol which left one Marine dead and three others wounded, last weekend. Operations have continued, with raids being carried out as well as navy planes and helicopters flying over the region.