By March, the few suitable aircraft in operational service were not serviceable most of the time.
The B-2 was first flown in 1989 and entered operational service in 1993.
Additional swimming pools, coupled with a number of slack tanks when in operational service, further reduce vessel stability.
The first of these to see operational service was the Soviet I-16, designed by Nikolay Polikarpov.
The result was the P-80 Shooting Star, the first American jet aircraft to enter operational service (1945).
Kensington Palace said in a statement: "His Royal Highness the Duke of Cambridge is to leave operational service in the armed forces.
However, operational, service and scheduling restrictions pose an obstacle to that, while "credit, or the risk of not getting paid for the gas, is an important consideration".
Prince Harry spent three and a half years in training and operational service with the Apache Force during his attachment to the Army Air Corps.
Kensington Palace said today in a statement: "His Royal Highness The Duke of Cambridge is to leave operational service in the Armed Forces.
That's not about being soft on crime, it's about properly understanding the effect that operational service can have and cutting reoffending.
The F-22 Raptor was conceived in 1981, took its first test flight in 1990, and did not enter operational service until 2004.
