This program briefing summarizes all Project Set 178A (PS178A) deliverables completed in 2021. The publications shown below are organized by publication date. Each citation includes the title, research contact, publication date, and an abstract. Webcasts organized and hosted by PS178A in 2021, aside from the Emerging Technology Webcast Series, are not included in this summary, but can be accessed by program members on the PS178A cockpit.