Federal executive branch departments and agencies have available to them various human resources management flexibilities for emergency situations involving severe weather, natural disaster, and other circumstances. At various times, the Office of Personnel Management issued guidance on these flexibilities, which supplements the basic policies governing staffing, compensation, leave sharing, and telework in Title 5 of the United States Code and Title 5 of the Code of Federal Regulations. Some examples of when issuances have occurred include following the September 11, 2001, terrorist attacks; in the aftermath of Hurricanes Katrina and Rita in 2005; in response to pandemic influenza in 2006; and in the aftermath of Hurricane Harvey in 2017.