The graph below shows the representation of active-duty Army recruits for 2004 and 2005 according to the median household income of their ZIP code.  (Data are not available for the individual recruit's household income.)  Each bar represents the ratio of two proportions:  the share of total recruits living in ZIP code areas where median household income falls within the specified range over the share of the total youth population living in the ZIP code.  A score of more than one means the income range is over-represented.  A score of less than one means the range is under-represented.  Note that the peak of the bars falls in the range of $30,000 to $59,999.  In other words, neighborhoods with low- to middle-median household incomes are over-represented.  Neighborhoods with high-median household incomes are under-represented.  (The comparable median household income for the U.S. is $47,837.)

The comparison between 2004 and 2005 indicates that upper-middle and high-income neighborhoods have fallen in representation from 2005. In other words, wealthier neighborhoods are less represented in 2005 than they were in 2004.  All neighborhoods with median household incomes between $30,000 to $54,999 increased in proportion.  All neighborhoods with median household incomes $55,000 or more decreased.  Taken together, the entire range from $55,000 and above became more under-represented.