To retain coverage, rights, and benefits under chapter 83 (“Retirement”) or chapter 84 (“Federal Employees Retirement System”) of title 5, if necessary employee deductions and agency contributions in payment for coverage, rights, and benefits for the period of employment with the tribal organization are currently deposited in the Civil Service Retirement and Disability Fund (section 8348 of title 5); and the period during which coverage, rights, and benefits are retained under this paragraph is deemed creditable service under section 8332 of title 5. Days of unused sick leave to the credit of an employee under a formal leave system at the time the employee leaves Federal employment to be employed by a tribal organization remain to his credit for retirement purposes during covered service with the tribal organization.

To retain coverage, rights, and benefits under chapter 89 (“Health Insurance”) of title 5, if necessary employee deductions and agency contributions in payment for the coverage, rights, and benefits for the period of employment with the tribal organization are currently deposited in the Employee’s Health Benefit Fund (section 8909 of title 5); and the period during which coverage, rights, and benefits are retained under this paragraph is deemed service as an employee under chapter 89 of title 5.

To retain coverage, rights, and benefits under chapter 87 (“Life Insurance”) of title 5, if necessary employee deductions and agency contributions in payment for the coverage, rights, and benefits for the period of employment with the tribal organizations are currently deposited in the Employee’s Life Insurance Fund (section 8714 of title 5); and the period during which coverage, rights, and benefits are retained under this paragraph is deemed service as an employee under chapter 87 of title 5.

an officer or employee of the United States assigned to a tribal organization (as defined in section 5304(l) of this title) or an inter-tribal consortium (as defined in section 5381 of this title), as authorized under section 3372 of title 5 or section 48 of this title may act as agent or attorney for, and appear on behalf of, such tribal organization or inter-tribal consortium in connection with any matter related to a tribal governmental activity or Federal Indian program or service pending before any department, agency, court, or commission, including any matter in which the United States is a party or has a direct and substantial interest: Provided, That such officer or employee must advise in writing the head of the department, agency, court, or commission with which the officer or employee is dealing or appearing on behalf of the tribal organization or inter-tribal consortium of any personal and substantial involvement with the matter involved; and

a former officer or employee of the United States who is carrying out official duties as an employee or as an elected or appointed official of a tribal organization (as defined in section 5304(l) of this title) or inter-tribal consortium (as defined in section 5381 of this title) may act as agent or attorney for, and appear on behalf of, such tribal organization or intra-tribal consortium in connection with any matter related to a tribal governmental activity or Federal Indian program or service pending before any department, agency, court, or commission, including any matter in which the United States is a party or has a direct and substantial interest: Provided, That such former officer or employee must advise in writing the head of the department, agency, court, or commission with which the former officer or employee is dealing or appearing on behalf of the tribal organization or inter-tribal consortium of any personal and substantial involvement that he or she may have had as an officer or employee of the United States in connection with the matter involved.