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In this special Technical Focus Issue of Materials Evaluation (ME), guest editors Surendra Singh of Honeywell Aerospace and Peter Collins of Iowa State University explore the paradigm shift in additive manufacturing (AM). Papers in this issue include a perspective on the role of in situ process monitoring in the certification of additive manufactured space hardware; an overview of thermocouple process monitoring for AM; a review of ultrasonic characterization of porosity in components made by binder jet AM; a paper on thermal calibration of an on-axis melt pool monitoring photodetector system; and a review of the needs and opportunities for coupling materials science and nondestructive evaluation for metals-based AM.