I lost 5 nuclear bombers and never managed to drop nuclear bomb. I do not know how, but once one player managed to kill 31 unit stack with 13 AA guns with nuclear bomber, and I did not managed to kill any unit with it. First time I tried it was killed by about 10 AA guns, later I tried first to attack with bombers and after that in 5 minutes nuclear bomber. he fall too. Than I tried to bomb province while his stock moves, and I waited him to be on 10 minutes from empty province and I sent a bomber on empty province but he fail too. Now I sent bomber to stock of 22 troops, 1 light, 5 medium tanks 7 SP arty 3AA guns level 2 , and 6 infantry and nuclear bomber fall again. 3AA level 2!!!! It is worthless to make any of Nuclear bombers and it is still mystery how people activate it. I haven`t managed yet.