Military Construction Appropriations Act, 2000 - Appropriates funds for FY 2000 for military construction, family housing, and base realignment and closure functions administered by the Department of Defense (DOD), namely: (1) military construction for the Army, Navy, and Air Force; (2) military construction, DOD (including a transfer of funds); (3) military construction for the Army and Air National Guards; (4) military construction for the Army, Navy, and Air Force Reserves; (5) the North Atlantic Treaty Organization (NATO) Security Investment Program; (6) family housing for the Army, Navy and Marine Corps, and Air Force; (7) family housing, DOD; (8) the Family Housing Revitalization Transfer Fund (including a transfer of funds); (9) the Department of Defense Family Housing Improvement Fund; and (10) the Base Realignment and Closure Account, Part IV. (Sec. 101) Specifies restrictions and authorizations regarding the use of funds appropriated in this Act and in other military construction appropriations Acts. (Sec. 113) Directs the Secretary of Defense to notify the appropriate congressional committees 30 days in advance of the plans and scope of any military exercise involving U.S. personnel if construction costs are anticipated to exceed $100,000. (Sec. 118) Authorizes the transfer of lapsed unobligated military construction and family housing funds into the Foreign Currency Fluctuations, Defense account. (Sec. 119) Directs the Secretary to report to the congressional appropriations committees on actions proposed by DOD to encourage other member nations of NATO, Japan, Korea, and U.S. allies in the Arabian Gulf to assume a greater share of the common defense burden of such nations and the United States. (Sec. 123) Authorizes the transfer of DOD funds for expenses associated with the Homeowners Assistance Program under the Demonstration Cities and Metropolitan Development Act of 1966. (Sec. 125) Reduces, with specified exceptions, each amount of budget authority provided in this Act for FY 2000 by five percent. (Sec. 126) Directs the Secretary to report to the congressional defense committees examining the adequacy of special education facilities and services available to the dependent children of military personnel stationed in the United States. (Sec. 127) Earmarks funds appropriated under the 1999 Emergency Supplemental Appropriations Act for the North Atlantic Treaty Organization Security Investment Program.