Possible Clues:

• Preserve old computer to which banks in Washington have access
• Foggy Bottom's river
• From one river to another, returning in a third
• Pilot Officer Thomas is superior to Aircraftman Flower
• River flowing through Washington DC
• Theodore Roosevelt Island setting
• River to join another river flowing back to American one
• River to computer is a different one
• Foreign banker puts a lot of money on old computer
• Washington, D.C.'s river