The United States Army and Project Manager (PM) Tactical Radio (TR) is seeking information on how an interested contractor could provide sustainment support services for the SKL including systems engineering, software development, software upgrades, technology insertion, testing, integration, training, obsolescence management, and configuration management for all SKL and PANDA versions (V2.0, V2.1, V3.0, V3.1, and V3.2) based on the Performance Work Statement (PWS) provided by Product Manager (PdM) Communications Security (COMSEC).PM TR will require a new Task Order to provide a seamless transition that mitigates risks associated with a break in services supporting the SKL V2.0, V2.1, V3.0, V3.1, and V3.2. This RFI describes the tasks and efforts that will be required by the vendor for sustainment support production and delivery of the Army, NSA Type 1 certified SKL units.