Lieutenant General Robert Frederick Sink (April 3, 1905 – December 13, 1965) was a United States Army officer during World War II, the Korean War, and early parts of the Vietnam War, though was most famous for his command of the 506th Parachute Infantry Regiment of the 101st Airborne Division.
Robert F. Sink, is commander of the 506th Parachute Infantry Regiment, appears as a fairly large role in Hell's Highway After and during the level "Five-Oh-Sink" Baker is officially under the command of Sink and he partakes in many of the 506th's missions during the campaign. Then later after World War II ranks Major Richard Winters and Captain Lewis Nixon.
- Sink is played by Dale Dye in the award winning miniseries, Band of Brothers. Dye later reprised the role of Sink in the third Brothers in Arms installment, Brothers in Arms: Hell's Highway.