A one way mission?

The prototype Su-7, designated S-1, first flew on September 7th, 1955. It was the first Soviet aircraft to fly faster then 2,000 Kph, and was chosen as the country's next fighter aircraft for Frontal Aviation. However, as the only aircraft in development with both the performance and payload to deliver tactical nuclear weapons, the Su-7 was quickly re-purposed as a fighter-bomber.