On July 15, 2026, US Defense Secretary Pete Hegseth said the military will begin testing testosterone levels once a year for service members aged 30 and older. Troops under 30 can choose to participate but are not required to. Al Jazeera

Testosterone is a hormone that affects energy, muscle strength, mood, and overall health in both men and women. Low levels can cause fatigue, loss of muscle, and other health problems.

Hegseth announced the plan in a video on X, formerly Twitter. The test will be added to a yearly health check-up that troops already get. If someone's levels are low, any treatment, including testosterone replacement therapy, is their own choice. Al Jazeera

Hegseth said the goal is "not about artificial enhancement" but about "restoring and optimising your natural capabilities." He said the testing is meant to fight what the military calls "Operator Syndrome," a term for the physical and mental wear that builds up after years of intense combat deployments. Al Jazeera; US Department of Defense

The idea came from Congress. A 2025 defense law required the defense secretary to report back on treatments for low testosterone and how the military currently tests for it. Al Jazeera

Some lawmakers are not happy. Senator Tammy Duckworth, a military veteran, said the plan sounds "like gender-affirming care to me." Representative Chrissy Houlahan, also a military veteran, said Hegseth "takes direction from the far corners of the manosphere," a term for online communities focused on male identity and fitness. Al Jazeera

Duckworth and Houlahan also said hormone screening should be offered to women in the military, pointing to high rates of infertility among service members. Al Jazeera

The broader question here is about personal choice versus military readiness. By adding testosterone testing to a routine check-up, the Pentagon is treating hormone levels as a measure of how ready someone is to serve. Hegseth's language frames it as a way to keep troops fighting longer, not just a personal health matter.

There is also uncertainty about what happens if someone's levels are low. Right now, turning down treatment has no stated career consequence, but that could change. The military has always had to balance fitness standards with individual medical decisions. Whether hormone data could eventually affect promotions, deployments, or command decisions is still an open question.

The congressional angle matters too. The 2025 law did not actually require testing. It asked for a briefing. Hegseth turned that request into a real policy, which gives lawmakers room to question whether the program is medically sound or politically motivated.

Duckworth and Houlahan's push to include women shifts the conversation from criticizing Hegseth to demanding equal attention to hormonal health across the whole military. If that gains support, the policy could grow to cover both men and women.

What happens next depends on details that have not been announced yet: what testosterone level counts as low, how privacy will be protected, and how the opt-in system for younger troops will work. Congress will likely ask for answers in hearings. For now, the policy is announced but not yet running.