daniel lewin was an american-israeli mathematician and entrepreneur who co-founded akamai technologies in 1998 with tom leighton. he co-invented the consistent hashing algorithm, a key innovation for content delivery networks (cdns) that improved internet speed and reliability by distributing web content efficiently across servers. he tragically died on september 11, 2001, as the first victim on american airlines flight 11 during the 9/11 attacks. wikipedia

Daniel Lewin - Wikipedia

akamai technologies https://www.akamai.com/company/leadership/akamai-remembers-danny-lewin

Which unit of the military did he serve in?

daniel lewin served in sayeret matkal, the israel defense forces' (idf) most elite special forces commando unit, where he rose to the rank of captain over four years. wikipedia https://en.wikipedia.org/wiki/daniel_lewin idf https://www.idf.il/en/articles/2021/daniel-lewin-the-israeli-american-9-11-hero/

Are you saying that first victim of the 9/11 attacks was an IDF special forces soldier?

yes, daniel lewin, identified as the first victim of the 9/11 attacks on american airlines flight 11, was a former captain in the israel defense forces' (idf) elite sayeret matkal commando unit. idf https://www.idf.il/en/articles/2021/daniel-lewin-the-israeli-american-9-11-hero/ wikipedia https://en.wikipedia.org/wiki/daniel_lewin