Military bases across the world are to stock the morning-after pill, the US Department of Defence has announced.
The Pentagon said the emergency contraception will be offered at all military facilities following a recommendation from an independent committee of doctors and pharmacists last year.
Leader of the abortion rights group NARAL Pro-Choice America, Nancy Keenan, welcomed the decision by President Barack Obama's administration after the policy was stopped under former leader George W Bush.
The Food and Drug Administration approved the sale of the the drug, which can prevent pregnancy after unprotected sex, to adults over-the-counter almost four years ago despite opposition from campaign groups, which describe it as an abortion pill.
The pill, which contains a high dose of birth control drugs, works by blocking ovulation and preventing a fertilised egg from attaching to the uterus.
A defence spokeswoman said she did not know when the policy would be rolled out.
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