Flags have flown at half-staff since the death of former President Jimmy Carter on Dec. 29. The official mourning period concludes Monday.

The White House ordered public flags to be displayed at half-staff for a period of 30 days from Carter's day of death, who died Dec. 29. Flags are flown at half-mast on ships and at naval stations. On shore, flags are flown at half-staff, meaning the flagpole is attached to a building or stuck in the ground.