You'll get MIL SERIES CONNECTOR packages.A CABLE AND PANEL mounting type is specified for the device.Additionally, there are other features such as STANDARD: MIL-DTL-38999, EMI SHIELDED, POLARIZED.
D38999/25HJ61ZC Features
D38999/25HJ61ZC Applications
There are a lot of TE Connectivity Deutsch Connectors D38999/25HJ61ZC Circular Connectors applications.