Many federal benefits are exempt from garnishment, including:
Social Security Benefits
Supplemental Security Income (SSI) Benefits
Civil Service and Federal Retirement and Disability Benefits
Service Members’ Pay
Military Annuities and Survivors’ Benefits
Railroad Retirement Benefits
Merchant Seamen Wages
Longshoremen’s and Harbor Workers’ Death and Disability Benefits
Foreign Service Retirement and Disability Benefits
Compensation for Injury, Death, or Detention of Employees of U.S. Contractors Outside the U.S.
Federal Emergency Management Agency Federal Disaster Assistance
But federal benefits may be garnished under certain circumstances, including to pay delinquent taxes, alimony, child support, or student loans.
Make sure these exempt funds are in a separate bank account. If they are co-mingled with non-exempt funds, they lose their "exempt" status.