Supreme headquarters Allied expeditionary force

Appeal to fear and prejudice

He appeals to fear by telling them that the Natzis are really trained but the have to go the war anyways and do their best to succeed because everyone, including him, is counting on them.

He is also using emotive terms to let them know that everyone will be there to support them and will pray for them. He is saying that like they were on there way to an live or die situation.