Always contact your references in advance to get their approval, and ensure that the agency can reach them by phone. Complete this item accurately, including current addresses and phone numbers for home and work. Do not sign the original, but make clear, legible copies. As you apply for jobs, fill in items 1 and 2, as appropriate. Also, sign and date each application.
Hand carry the application or mail it.
Absolutely do not use a Government pre-paid penalty envelope. Not only is it illegal, but some agencies will throw away applications received in Government envelopes. Remember, an SF-171 provides a history of you. As you change jobs, receive more training in school and work, or assume new responsibilities, incorporate this information on your SF-171. Also, if the requirements vary from the different positions you apply for, revise your SF-171 to fit each job.