[1] Forty ships is 10 percent below the minimum suggested in the Bottom-Up Review conducted by the Department of Defense. RAND assessed this small fleet in some detail because it was found that higher force objectives could not be sustained over a variety of production rates if restart is postponed beyond the mid-1990s.

[2] Future costs that are nominally the same as earlier costs must be discounted for meaningful comparison--the earlier sum could be invested otherwise to realize additional earnings or benefits in the interim.