foreign countries. public health preparedness and response For carrying out titles II, III, and XVII of the PHS Act with respect to public health preparedness and response, and for expenses necessary to support activities related to countering potential biological, nuclear, radiological, and chemical threats to civilian populations, $1,405,000,000, of which $575,000,000 shall remain available until expended for the Strategic National Stockpile: Provided , That in the event the Director of the Centers for Disease Control and Prevention (referred to in this title as CDC ) activates the Emergency Operations Center, the Director of the CDC may detail CDC staff without reimbursement for up to 90 days to support the work of the CDC Emergency Operations Center, so long as the Director provides a notice to the Committees on Appropriations of the House of Representatives and the Senate within 15 days of the use of this authority and a full report within 30 days after use of this authority which includes the number of staff and funding level broken down by the originating center and number of days detailed: Provided further , That funds appropriated under this heading may be used to support a contract for the operation and maintenance of an aircraft in direct support of activities throughout CDC to ensure the agency is prepared to address public health preparedness emergencies. Buildings and facilities (including transfer of funds) For acquisition of real property, equipment, construction, demolition, and renovation of facilities, $10,000,000, which shall remain available until September 30, 2022: Provided , That funds previously set-aside by CDC for repair and upgrade of the Lake Lynn Experimental Mine and Laboratory shall be used to acquire a replacement mine safety research facility: Provided further , That in addition, the prior year unobligated balance of any amounts assigned to former employees in accounts of CDC made available for Individual Learning Accounts shall be credited to and merged with the amounts made