30, 2021: Provided further , That in order to enhance the safety of Bureau field employees, the Bureau may use funds to purchase uniforms or other identifying articles of clothing for personnel. Contract support costs For payments to tribes and tribal organizations for contract support costs associated with Indian Self-Determination and Education Assistance Act agreements with the Bureau of Indian Affairs for fiscal year 2019, such sums as may be necessary, which shall be available for obligation through September 30, 2020: Provided , That notwithstanding any other provision of law, no amounts made available under this heading shall be available for transfer to another budget account. Construction (including transfer of funds) For construction, repair, improvement, and maintenance of irrigation and power systems, buildings, utilities, and other facilities, including architectural and engineering services by contract