變更

在就读塔夫茨大学期间，他加入了{{link-en|预备役军官训练团|Naval Reserve Officers Training Corps}}，并在毕业后正式加入[[美國海軍|美国海军]]。<ref>{{Cite web|url=https://tuftsdaily.com/archives/2006/02/27/in-our-midst-in-the-navy-soon-daniel-crenshaw-will-make-the-leap-from-jumbo-to-seal/|title=In our midst &#124; In the Navy soon: Daniel Crenshaw will make the leap from Jumbo to SEAL|publisher=The Tufts Daily|date=2006-02-27|accessdate=2018-11-05|archive-url=https://web.archive.org/web/20181106132321/https://tuftsdaily.com/archives/2006/02/27/in-our-midst-in-the-navy-soon-daniel-crenshaw-will-make-the-leap-from-jumbo-to-seal/|archive-date=2018-11-06|dead-url=yes}}</ref>他在[[海豹部隊|海军海豹突击队]]服役了十年，并且出兵海外五次，达到了中尉指挥官的级别。<ref name="ops">{{Cite web|url=https://www.opslens.com/2018/01/20/navy-seal-glass-eye-envisions-winning-us-congress-seat/|title=Navy SEAL With Glass Eye Envisions Winning US Congress Seat – OpsLens|date=2018-01-20|accessdate=2018-11-05|archive-url=https://web.archive.org/web/20181106132356/https://www.opslens.com/2018/01/20/navy-seal-glass-eye-envisions-winning-us-congress-seat/|archive-date=2018-11-06|dead-url=yes}}</ref>克伦肖是海豹突击队三队的成员。<ref name="TXtribune2018">{{cite magazine |last=Watkins |first=Matthew |date=November 4, 2018 |title=After SNL mocks his war injury, Texas congressional candidate Dan Crenshaw says he tries hard "not to be offended" |url=https://www.texastribune.org/2018/11/04/dan-crenshaw-dismisses-snl-joke-about-his-war-injury/ |magazine=The Texas Tribune |access-date=November 7, 2018 }}</ref>