The US military has scrapped the 1994 policy which banned women from combat roles according to a Pentagon statement.
The White House has said that President Obama strongly supports the decision.
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Armed police have carried out a raid apparently linked to Wednesday's deadly terror attack in Westminster.
Cheryl Grimmer vanished from inside a beach shower block in Wollongong, Australia, in 1970, when she was just three.
Pc Keith Palmer was on the front line and because of his actions, the Westminster attacker was unable to kill anyone else.