Welcome to Volume 3 of IEEE JOURNAL OF MICROWAVES! In this issue we combine a complete set of regular contributions with Part 1 of a Microwave Theory and Technology Society 70th Anniversary commemoration, consisting of some twenty-one specially invited papers embodying this major milestone in the history of the organization. Several additional articles, including some major historic overviews, are to be released in our spring issue of JMW which contains Part 2 of this 70th Anniversary celebration. In order to make it possible to bring up all the anniversary issue papers contained in both parts one and two using a single database search, every special issue paper contains the index term: "MTT 70th Anniversary Special Issue." The full set (covering two issues) of 70th anniversary papers can be accessed using a simple parenthesis-delineated search of the five-word phrase. Plans are also in place to combine all the on-line papers into a full-color print issue for distribution upon request. In addition to this very nice collection of quality papers, we celebrate six of our Outstanding Reviewers of 2021 and 2022 and announce our first IEEE JOURNAL OF MICROWAVES Best Paper prize. INDEX TERMS Winter issue, opening editorial, MTT 70th Anniversary Special Issue, outstanding reviewers, reviewer recognition, best paper prize, editorial board. ING, AND ARRAY SYSTEMS & TERAHERTZ TECHNOLOGY AND APPLICATIONS KEN B. COOPER (Senior Member, IEEE) received the A.B. degree in physics from Harvard College, Cambridge, MA, USA, in 1997, and the Ph.D. degree in physics from the California Institute of Technology, Pasadena, CA, USA, in 2003. Following postdoctoral research in superconducting microwave qubits, he has been an RF Microwave Engineer with Jet Propulsion Laboratory (JPL), NASA, since 2006, where he has been recognized with the Lew Allen Award for Excellence, Ed Stone Award for an Outstanding Research Publication, and a Principal designation for the development of active THz sensors, systems, and techniques. His work with JPL has included the development of scanning 340 GHz and 670 GHz imaging radars for concealed object detection, a compact 95 GHz Doppler radar and 270/560 GHz spectrometer for cometary jet observation, and differential absorption radars at 170 GHz and 560 GHz for humidity sounding on Earth and Mars. TC-12 TOPIC EDITOR: MICROWAVE HIGH-POWER TECHNIQUES STEVE C. CRIPPS (Life Fellow, IEEE) received the master's and Ph.D. degrees from Cambridge University, Cambridge, U.K., in 1970. After working for several years with the Pioneering Gallium Arsenide (GaAs) Group, Plessey Research, he emigrated USA, where he worked for 15 years in various engineering and management positions with Watkins Johnson, Loral, and Celeritek. In 1996, he returned to the U. K., as an independent consultant before taking on an academic post with Cardiff University, Cardiff, U.K., where he is currently a Distinguished Research Professor. He has authored several bestselling books on RFPA design and is a regular contributor to IEEE Microwave Maga...