British imperialism always paid at least lip service to something higher (notions of service, noblisee oblige all that balls), is probably due to having Queen as slave-to-duty role model - if your head of states a prez, for whom, typically, the longest book his read is his inauguration oath, you're gonna need some serious faith, not in something you can ground in any kind of argumentative/rational basis, but in blind commitement to "values" apparently implicit in your national cause - hence no need for rhetoric;

The speech given to British troops by Lt. Col Tim Collins:

"If you are ferocious in battle, remember to be magnanimous in victory. We go to liberate, not to conquer. We are entering Iraq to free a people, and the only flag that will be flown in that ancient land is their own. Don't treat them as refugees, for they are in their own country. If there are casualties of war, then remember, when they woke up and got dressed in the morning they did not plan to die this day. Allow them dignity in death. Bury them properly and mark their graves. You will be shunned unless your conduct is of the highest, for your deeds will follow you down in history. Iraq is steeped in history. It is the site of the Garden of Eden, of the Great Flood and the birth of Abraham. Tread lightly there."

The speech given US troops by Vice Admiral Timothy Keating:

"When the President says 'Go', look out - it's hammer time." (Followed by “We Will Rock You” played at high volume.)