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Defense is the American spelling of Defence.
containment policy
Spelling; the UK spells it defence and the US defense. Canada tends towards defence.
Yves Boyer has written:
'British-French Defense and Security Cooperation (Strategic Defence Studies)'
'French national defence policy and the new majority'
In the US, defense. In the UK, defence.
(see related link)In England, you spell it "defence." In the U.S., you spell it "defense."