Good - Calibri is not open, badly supported on Linux et al.
HN should rejoice in the US gov using a font that is open and truly cross platform.
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HN should rejoice in the US gov using a font that is open and truly cross platform.
But there are open-source metrically-compatible alternatives to all of them, commonly included in Linux distributions and/or office suites like LibreOffice.
Probably the most popular set is https://en.wikipedia.org/wiki/Croscore_fonts, with Tinos, Arimo, Cousine, and in the extended set Carlito and Caladea. The former most popular set is probably https://en.wikipedia.org/wiki/Liberation_fonts, with Liberation {Serif, Sans, Mono}.
But a given system is definitely less likely to have a Calibri alternative than a Times New Roman alternative.