Can all MIL-DTL-38999 connectors accept backshells?

All types of plugs and receptacles can accept backshells, except box mounting receptacles (LJT02, LJTP02, JT02, JTP02, TVP02, CTVP02), which do not have any thread at the rear of connector. 

Each backshell can be used on both plug and receptacle of the same connector range and size (ex: TV NSA 15 014 can be put at the rear of both TV06RW1535P and TVP00RW1535S or TV07RW1519P)

Content réference
LJT/HE308 - D38999 Series I
JT - D38999 Series II
TV-CTV - D38999 Series III
Metallic backshells