 It is intended to supplement and eventually replace the AN/CYZ-10 Data Transfer Device (DTD).The PYQ-10 provides all the functions currently resident in the CYZ-10 and incorporates new features that provide streamlined management of COMSEC key, Electronic Protection (EP) data, and Signal Operating Instructions (SOI).Cryptographic functions are performed by an embedded KOV-21 card developed by the National Security Agency (NSA).