Sentence:  - Expenditures for operating and maintaining the stations and equipment of the Armed Forces are estimated to be $ 10.3 billion in 1961 , which is $ 184 <WSD>million</WSD> more than in 1960 . 
Meaning of the word marked with <WSD> tags:  (in Roman numerals, M written with a macron over it) denoting a quantity consisting of 1,000,000 items or units