powder monkey: someone who carries explosives (as from the magazine to the guns on board a warship)
assistant: a person who contributes to the fulfillment of a need or furtherance of an effort or purpose
minnesota multiphasic personality inventory: a self-report personality inventory consisting of 550 items that describe feelings or actions which the person is asked to agree with or disagree with; many scales estimating traits and qualities of personality have been developed using MMPI items