A thrust reverser system for a gas turbine engine, comprising: a support structure configured to be mounted to the turbine engine; a transcowl mounted on the support structure and axially translatable, relative to the support structure, between a stowed position and a deployed position; an actuator configured to supply an actuation force to the transcowl to thereby move the transcowl between the stowed and deployed positions; and a hydraulic assist mechanism coupled to the transcowl and configured to react reverse thrust loads on the transcowl at least when the transcowl is translating between the stowed position and the deployed position, the hydraulic assist mechanism including: a housing having an inner surface that defines a piston chamber, a piston movably disposed within the housing and dividing the piston chamber into a first variable fluid volume and a second variable fluid volume, a rod having a first end and a second end, the first end coupled to the piston, the second end coupled to the transcowl, whereby the first variable fluid volume decreases when the transcowl is translating between the stowed position and the deployed position, a snubbing conduit in fluid communication with the first fluid volume and the second fluid volume, and a throttle valve disposed within the snubbing conduit and configured to throttle fluid flow from the first variable fluid volume to the second variable fluid volume when the transcowl is translating between the stowed position and the deployed position, wherein the throttle valve comprises: a valve body including a first control volume and a second control volume; a spool movably disposed within the valve body; and a spring disposed within the first control volume and supplying a bias force to the spool. a support structure configured to be mounted to the turbine engine; a transcowl mounted on the support structure and axially translatable, relative to the support structure, between a stowed position and a deployed position; an actuator configured to supply an actuation force to the transcowl to thereby move the transcowl between the stowed and deployed positions; and a hydraulic assist mechanism coupled to the transcowl and configured to react reverse thrust loads on the transcowl at least when the transcowl is translating between the stowed position and the deployed position, the hydraulic assist mechanism including: a housing having an inner surface that defines a piston chamber, a piston movably disposed within the housing and dividing the piston chamber into a first variable fluid volume and a second variable fluid volume, a rod having a first end and a second end, the first end coupled to the piston, the second end coupled to the transcowl, whereby the first variable fluid volume decreases when the transcowl is translating between the stowed position and the deployed position, a snubbing conduit in fluid communication with the first fluid volume and the second fluid volume, and a throttle valve disposed within the snubbing conduit and configured to throttle fluid flow from the first variable fluid volume to the second variable fluid volume when the transcowl is translating between the stowed position and the deployed position, wherein the throttle valve comprises: a valve body including a first control volume and a second control volume; a spool movably disposed within the valve body; and a spring disposed within the first control volume and supplying a bias force to the spool. a housing having an inner surface that defines a piston chamber, a piston movably disposed within the housing and dividing the piston chamber into a first variable fluid volume and a second variable fluid volume, a rod having a first end and a second end, the first end coupled to the piston, the second end coupled to the transcowl, whereby the first variable fluid volume decreases when the transcowl is translating between the stowed position and the deployed position, a snubbing conduit in fluid communication with the first fluid volume and the second fluid volume, and a throttle valve disposed within the snubbing conduit and configured to throttle fluid flow from the first variable fluid volume to the second variable fluid volume when the transcowl is translating between the stowed position and the deployed position, wherein the throttle valve comprises: a valve body including a first control volume and a second control volume; a spool movably disposed within the valve body; and a spring disposed within the first control volume and supplying a bias force to the spool. a valve body including a first control volume and a second control volume; a spool movably disposed within the valve body; and a spring disposed within the first control volume and supplying a bias force to the spool.