Someone posted this USCIS memo on visajourney.com. It contains a lot of useful information, so I figured I'd repost it here.
http://www.uscis.gov/files/nativedocuments/natz_interview_apr2508.pdf
Pay specific attention to the section that states that effective immediately (the memo was issued on April 25, 2008), all applicants will sign their photos with their NORMAL signature.
http://www.uscis.gov/files/nativedocuments/natz_interview_apr2508.pdf
Pay specific attention to the section that states that effective immediately (the memo was issued on April 25, 2008), all applicants will sign their photos with their NORMAL signature.