USCIS Policy Memo: Submission of Form 1-20 or DS-2019 in support of the Application to Extend/Change Nonimmigrant Status

"This Policy Memorandum (PM) establishes U.S. Citizenship and Immigration Services (USCIS) policy on the adjudication of the Application to Extend/Change Nonimmigrant Status (Form 1-539)." - USCIS, June 1, 2012.