The purpose of this effort is to modify the A-10-specific external Improved Data Modems (IDM) for the fleet to use with both the ARC-210 Gen 6 and Gen 4 radios. This will be an IDIQ contract to upgrade up to 278 external IDMs with a 36 month ordering period and 48 month delivery period. There will be an optional warranty to support repair/replacement issues regarding the modified IDM components. To obtian CDRLS a 2345 form must be sent to