The packaging contains MIL SERIES CONNECTOR.CABLE AND PANEL is the mounting type of the device.There are also other features such as STANDARD: MIL-DTL-38999, EMI SHIELDED, POLARIZED, to name only a few.
D38999/23HJ43XC Features
D38999/23HJ43XC Applications
There are a lot of TE Connectivity Deutsch Connectors D38999/23HJ43XC Circular Connectors applications.