The first operational version was the B-52B that had been developed in parallel with the prototypes since 1951.

They were the operational version of research and development Project Space Track.

The Mark 2 Mod 2: this was the first operational version.

The Mark 2 Mod 3: this was the last operational version.

The Scavenger was the operational version of the X-18.

Moreover, producing operational versions of very accurate missiles with conventional warheads will take 5 to 10 years.

Construction of an operational version will proceed under Government sponsorship 1823-32 but it will never be completed.

Development of an operational version was given the highest priority.

It was the operational version of research and development Project Space Track.

There are at least five different operational versions of the Ch'ŏnma-ho.