From the Document: "Though the common use of the word 'procurement' implies the buying of all things, within the defense community procurement refers to the appropriations title by that name. Procurement is the DOD appropriations title that provides funds to purchase major equipment. DOD classes procurement appropriations as nonconstruction-related 'investment costs,' or the costs to acquire capital assets, such as an F-35 Joint Strike Fighter or a Virginia-class submarine. Investment costs are distinguished from 'expenses,' which are consumed in the operating of the Department. At over $100 billion of annual funding in recent years, the procurement title represents about 20% of the base defense budget. DOD uses these funds to buy several different types of [material.]"
CRS In Focus, IF10599
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html