41 CFR 301-52.3 - Am I required to file a travel claim in a specific format and must the claim be signed?
As soon as your agency fully deploys the E-Gov Travel Service (ETS), you must use the ETS to file all your travel claims. (Agencies are required to fully deploy the ETS no later than September 30, 2006.) Until that time, you must file your travel claim in the format prescribed by your agency. If the prescribed travel claim is hardcopy, the claim must be signed in ink. Any alterations or erasures to your hardcopy travel claim must be initialed. If your agency has electronic processing, use your electronic signature where required.