I have both DLCs (Havoc & Ascendance) for COD AW for Xbox 360 but can only use OHM variants and none of the AE4 variants AT ALL. Please help

I have downloaded both the Havoc and Ascendance DLC for Call of Duty: Advanced Warfare and cannot use The AE4 assault rifle. I also cannot use the regular OHM or the OHM Werewolf, but I can use OHM variants. I don't know what to do please help.