The current NOAD Schema 3.5 has been in effect since May 26, 2015. NOAD Schema 3.4 is missing required information fields and will no longer be supported. Any submitted NOAD form utilizing Schema 3.4 after the retirement date (to be determined) will be rejected.
Source: USCG
Link: 3/23/2018: Reminder – NOAD Schema 3.4 to be retired