We are pleased to announce the official release of the March 2021 Kestrel TSCM | SIGINT newsletter for online viewing or download as a PDF file. This latest edition introduces the highly anticipated Kestrel Learning Mode (KLM) technology and a fully integrated Burst Detection capability. This newsletter edition also introduces the recently released Operator Frequency Database (OFD) feature. The mighty Kestrel TSCM Professional Software continues to evolve with each new official release.