Before his current appointment, Hegseth was best known for appearing as a political pundit on Fox News. He has no experience running a massive department with life and death consequences.

The only semi-relevant experience Hegseth has in large-scale organization management is as the head of two veterans nonprofits : Vets for Freedom (2007-2011) and Concerned Veterans for America (2016).

• Hegseth was executive director of Vets for Freedom, which advocated for expanding the war in Iraq. In 2009, Hegseth admitted that the organization was half a million dollars in debt. He was demoted in 2011.

• Concerned Veterans for America was funded by the infamous Koch brothers, Charles and David Koch. A recently published whistleblowers report revealed that Hegseth was later removed from his position as president of the organization due to being frequently intoxicated and engaging in sexual impropriety.
  

Hegseth previously convinced Trump to pardon convicted war criminals.

Hegseth is a serial adulterer. He paid a settlement to a woman accusing him of sexual assault, claiming it was consensual adultery rather than assault or rape. As Secretary he would have access to deeply classified military information that foreign enemies will attempt to pry from him through any means necessary, including sexual persuasion.