Can you join the military with flat feet?

Enlistment medical standards for the military services come from one document, DoW Instruction 6130.03, Volume 1. The current version is Change 6, effective February 3, 2026. Flat feet get exactly one line, in the foot and ankle list:1

That is the whole rule. Three things follow from how it is written.

Plenty of pages online say one branch is stricter about flat feet than another. The medical standard gives no basis for that. What does differ is who decides a waiver, because each service makes its own waiver decisions.1

Somewhere between 20% and 37% of people have some degree of flat foot, and most of those feet are flexible.3 A flexible flat foot has a normal arch when it is not bearing weight. The arch disappears when you stand on it, and comes back when you take the weight off.3

A rigid flat foot stays flat either way. It is rare. It usually starts in childhood, though it can appear at any age, and it can come from a tarsal coalition (two foot bones joined that should be separate), an accessory navicular bone, congenital vertical talus, or another congenital problem in the back of the foot.3

An examiner tells the two apart by looking at the foot both standing and not standing, and by moving the joints. One named maneuver, the Hubscher maneuver (also called the Jack test), checks whether the flattening can be undone.3 You can do the simplest part yourself: sit with your foot hanging, look at the inside edge, then stand and look again.

For most applicants with flat feet, this is the word that matters. The line does not define it, so read it in its plain sense: the foot causes symptoms. Pain is the obvious one. A history of treatment for foot pain tells the same story on paper, and paper is what a medical review works from.

Flat feet also tend to travel with other items on the same list, and each of those has its own line:1

The toe items are worth checking alongside the arch. A clinical review of flat feet notes that people with pes planus may also have a bunion and hammer toes.3 If yours hurt, that is a separate symptomatic line, even when the arch itself is quiet.

High arches are worth a second look, because they are the opposite problem and they sit in the same sentence as clubfoot. They are not disqualifying on sight. The test is the boot and the symptoms.1 If that is your foot, the clubfoot eligibility page walks through that exact line.

The belief that flat feet break down under military training is old and widespread. When researchers measured recruits before training and followed them through it, the answer came out far less tidy.

Put together, a flat arch on its own is a weak predictor. One study found the flattest feet at the lowest risk and another found no link with injury at all. Of the studies that did tie low arches to problems, two found that high arches carried risks of their own. That fits the way the standard is written. It does not screen for the shape. It screens for rigidity and symptoms.

Not meeting a standard is not the end of an application. The instruction allows applicants who do not meet a standard to be considered for a medical waiver, except for conditions listed as ineligible.1

The list that instruction points to is a July 2025 Secretary of Defense memorandum, which sorted certain conditions into two groups: one that only the Secretary of a Military Department can waive, and one that cannot be waived at all.2 Absence of a foot is on the first list. Flat feet, high arches, plantar fasciitis and toe deformities appear on neither.2 They go through the ordinary waiver route.

Being eligible for a waiver is not the same as getting one. What a waiver reviewer can work with is evidence: what the foot does now, what treatment it has had, and whether it has held up under running and load. Disclose the history in full. A page of old orthotic prescriptions that you declared reads very differently from the same page discovered later.