Mike Gravel quoted the U.S. as being war hungry drunk. He believes his country is a drunkard who declares war on anyone who poses a threat to them. Additionally, he believes that the United States is an imperialistic nation which is going downhill. This could be true, especially in the case of Great Britain during WWII.
Waging a conventional war means using conventional weapons such as guns, tanks, bombs etc. We no longer see conventional weapons used as means to end war or to commit a crime. Unconventional weapons are used to put the final blow to the enemy and to commit crimes of assault, murder etc.