Trainee promotion

One day a general was traveling down the back roads of Lackland Air Force base when his driver lost control of the vehicle and crashed. A quick thinking basic-trainee pulled the general from the burning wreck seconds before it exploded. "Son for your quick thinking and bravery" said the general, " I want to promote you." "Any rank you'd like is yours for saving my life". The stunned trainee sat speechless Thinking. "How's about we make you a 2nd Lieutenant?" "Would you like that, a commission right out of basic training?" asked the general. "I don't think so, sir" the trainee replied. "Well how about a 1st Lieutenant then, that's a step higher?" Again the trainee thought, and refused. "Well son, Captain is the next step above that, and as high as I'd be able to promote you, how's that sound?" "The trainee thought for a minute and sheepishly replied, "Well Sir, 2nd Lieutenant, 1st Lieutenant, Captain, they all sound good, but what I'd really like to be, well, is a Master Sergeant." "I'm very sorry son, I can't do that " the general replied, " you have to test to become a Master Sergeant."