United States government

The only known cabinet level administration officer was Vice-President (President of the Senate also), the first person on the presidential line of succession.

Pre-war Cabinet positions and possible Cabinet positions in the Enclave were:
 * Secretary of War, who supervised US Armed Forces (the War Department existed before the War),
 * Secretary of Treasure - because of Divergence in Fallout world his Department should have overseen law enforcement agencies and Secret Service among them.

Very likely Cabinet present in the Enclave was minimally staffed (eg. the first American President appointed a Cabinet of four people).

Possible pre-war Cabinet position was Administrator of the Environmental Protection Agency also.