DARPA (US defense research agency) looked into using human cannons to launch firefighters onto high buildings. I wonder why they didn’t continue the research.

Dutch newspaper article: https://www.nrc.nl/nieuws/2022/06/24/hoe-kan-een-menselijke-kanonskogel-het-afschieten-overleven-a4134586

Patent: https://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220060086349%22.PGNR.&OS=DN/20060086349&RS=DN/20060086349