In the event of the death a present or former official of the government of any State, territory, or possession of the United States, the Governor of that state, territory, or possession may proclaim that the National flag shall be flown at half-staff." The code also includes other related details including the specific length of time during which the flag should be displayed at half-staff, in the event of the death of a "principal figure"
"(e.g., 30 days for the death of a sitting or former President, 10 days for the death of a sitting Vice-President,etc.).