F35B – Jump Jet Milestone - the F35B – Jump Jet (to be named LIGHTNING II in British service) has dropped its first bomb as it completed another successful test milestone in the USA.   A 1,000lb practice bomb was dropped from the internal bay of a jump jet which will be the mainstay of Royal Navy aircraft carrier operations from the end of the decade, over a range off the Eastern Seaboard.      The F35 is classed as the world’s ‘fifth generation’ jet fighter – the Gloster METEOR and Messerschmitt 262 were first, the HARRIER third, while the RAF’s TYPHOON is deemed a fourth generation jet.