A gas turbine engine comprising: a combustor section including a combustor assembly; and a turbine section, wherein the combustor assembly comprises: a tangential onboard injector (TOBI) module including an annular TOBI housing, the TOBI housing having a plurality of circumferentially arranged axially extending slots, characterized in that the combustor assembly comprises: a circumferential array of vanes providing a first fixed stator stage of the turbine section, each vane including a dovetail removably received within a respective one of said slots, wherein the TOBI housing includes a plenum, a circumferential array of axially extending TOBI nozzles, a first passageway, and one or more cooling passages through one or more openings, the plenum being arranged radially between the upper slots and the lower nozzles, and wherein a nozzle of the array of nozzles is fluidly connected to the plenum via the first passageway, and a vane of the array of vanes is fluidly connected to the plenum via the one or more cooling passages that communicate cooling fluid from the plenum to cooling passageways within said vane. a combustor section including a combustor assembly; and a turbine section, wherein the combustor assembly comprises: a tangential onboard injector (TOBI) module including an annular TOBI housing, the TOBI housing having a plurality of circumferentially arranged axially extending slots, characterized in that the combustor assembly comprises: a circumferential array of vanes providing a first fixed stator stage of the turbine section, each vane including a dovetail removably received within a respective one of said slots, wherein the TOBI housing includes a plenum, a circumferential array of axially extending TOBI nozzles, a first passageway, and one or more cooling passages through one or more openings, the plenum being arranged radially between the upper slots and the lower nozzles, and wherein a nozzle of the array of nozzles is fluidly connected to the plenum via the first passageway, and a vane of the array of vanes is fluidly connected to the plenum via the one or more cooling passages that communicate cooling fluid from the plenum to cooling passageways within said vane. a tangential onboard injector (TOBI) module including an annular TOBI housing, the TOBI housing having a plurality of circumferentially arranged axially extending slots, characterized in that the combustor assembly comprises: a circumferential array of vanes providing a first fixed stator stage of the turbine section, each vane including a dovetail removably received within a respective one of said slots, wherein the TOBI housing includes a plenum, a circumferential array of axially extending TOBI nozzles, a first passageway, and one or more cooling passages through one or more openings, the plenum being arranged radially between the upper slots and the lower nozzles, and wherein a nozzle of the array of nozzles is fluidly connected to the plenum via the first passageway, and a vane of the array of vanes is fluidly connected to the plenum via the one or more cooling passages that communicate cooling fluid from the plenum to cooling passageways within said vane. a circumferential array of vanes providing a first fixed stator stage of the turbine section, each vane including a dovetail removably received within a respective one of said slots, wherein the TOBI housing includes a plenum, a circumferential array of axially extending TOBI nozzles, a first passageway, and one or more cooling passages through one or more openings, the plenum being arranged radially between the upper slots and the lower nozzles, and wherein a nozzle of the array of nozzles is fluidly connected to the plenum via the first passageway, and a vane of the array of vanes is fluidly connected to the plenum via the one or more cooling passages that communicate cooling fluid from the plenum to cooling passageways within said vane.