Applicants may also submit the following supporting document type(s), which may not be required for all applicants: Veterans Preference documentation - If you are a veteran, you must submit a copy of your DD Form 214, Certificate of Release or Discharge from Active Duty (Member Copy - 4) and, if applicable, and Application for 10-Point Veterans Preference and an official document dated 1991 or later, from the Department of Veterans Affairs or from a branch of the Armed Forces that supports your claim. Customer Service - Works with clients and customers (that is, any individuals who use or receive the services or products that your work unit produces, including the general public, individuals who work in the agency, other agencies, or organizations outside the Government) to assess their needs, provide information or assistance, resolve their problems, or satisfy their expectations; knows about available products and services; is committed to providing quality products and services.