KY-99A
From The RadioReference Wiki
The ANDVT MINTERM KY-99A is a low-cost, lightweight, low-power, single channel, half-duplex, narrowband/wideband/wireline terminal providing secure voice and data communications with full key distribution and remote rekey capabilities. The KY-99A is interoperable with ANDVT AIRTERM KY-100, ANDVT TACTERM AN/USC-43 (include KYV-5), VINSON KY-57/KY-58, DSVT KY-68, and SINCGARS equipment. MINTERM's modular distributed architecture provides independent reprogrammable RED, COMSEC and BLACK processing sites with software-controlled interfaces to meet today's needs and the flexibility to easily upgrade for tomorrow's requirements.
The latest DoD LPC-10e algorithm (v53) has been enhanced to provide high quality secure narrowband voice at 2.4 kbps from military handsets and to maintain that quality and intelligibility in noisy acoustical environments. MINTERM also provides CVSD at 12 and 16 kbps for secure wideband voice modes.