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In determining cost effectiveness , consideration is given to several factors , including alternative power systems and alternative weapons systems that may be used to accomplish the missions of the ship and the fact that it is difficult to prorate the total cost of a ship among all of the missions it is designed to perform . Words , like planes in abstract painting , function not as units in a logical structure , but as units functioning in a vital and organic structure of time . Helping readers look at moral issues seriously , intelligently , and from a Christian perspective , this comprehensive and thought-provoking introduction to the study of Christian ethics emphasizes the use of scripture , tradition , and the Christian community as resources to help formulate a personal approach in ethical living as it describes a variety ... Donald Banfield , a rover science team member , fielded numerous media questions . The minimum core data elements are : first and last name , date of birth , and Social Security or driver 's license number . Major weapons systems take ten to fifteen years to develop , and then they they are in inventory for twenty to forty years .