this spending was incremental to the "base" department of defense budget, which also increased faster than inflation during the period. the comptroller of the department of defense (dod) estimated spending for "overseas contingency operations" (oco), analogous to the crs amount above, at $748 billion for the 2001-2008 period. this was incremental to the "base" dod budget, which totaled $3.1 trillion during the 2001-2008 period.