The V/1500 only just reached operational service as the war ended in 1918.

Protracted development of the Mk 21 meant that this variant did not reach operational service until January 1945.

It was unsuccessful and dd not reach service, with several having their electronic equipment removed to become U-21D utility aircraft.

Like Titan, 33 are intended to reach service.

In 1971, I-37 reached FM 888 and service to the city of Mathis.

When this mark reached service, use of the dive brake was found to sometimes overstrain the rear fuselage, so it was often removed.

We could probably double our book budget and still not reach maximum service to this community.

A total of 381 aircraft were produced, but only some 85 aircraft reached front-line service before the Armistice.

Vixen was developed but appears to have never reached service.

Although not fully meeting the requirements of the specification, the Valiant design posed little risk of failure and could therefore reach service earlier.