dianavan - You are priceless!!

But to answer your questions:

"who is responsible for evaluating that intelligence?"

Probably some under-paid, overworked civil servant(UK)/government worker (USA)

"Who is responsible for the command of the armed forces in general?"

The titular head of the armed forces in the UK is HM Queen Elizabeth/ in the USA the titular head of the armed forces is the President. Neither is responsible for actual command of the armed forces, or for conduct of operations.

Historical note for you lass, in the US the armed forces swear allegiance to the flag and to defend the Constitution - they do not swear an oath of allegiance to the President of the United States. Now far from being titular heads of their armed forces, both Hitler and Saddam were very much hands-on boys - they insisted, by the way, that their troops swore an oath of allegiance to them personally, not the country, not the flag - but to them personally.

"If a teacher has a class of youngsters who are behaving badly, the teacher is blamed for poor classroom management. Isn't he supposed to be the top dog? ...the one in charge?" - Very poor example, of course the teacher is the one in charge - he is the equivalent to the platoon or company officer - you wouldn't, however, blame the President, isn't his administration supposed to be in charge of education?