SEMPER FI- Meaning, Always Faithful.
I'm not sure what you mean by "slogan", but "Semper Fidelis" is the official motto of the US Marine Corps (the motto is often shortened, in unofficial usage, to simply "Semper Fi"). "The Few, the Proud, ... the Marines" has often been used in recruiting advertisements.
Semper Fidelis - Always Faithful
Brazilian Marine Corps's motto is 'Adsumus'.
The motto of First Federal Bank of the Midwest is 'Bank with the people you know and trust.'.
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The motto of Officer Candidates School - United States Marine Corps - is 'Leadership by Example'.
The United States Marine Corps was founded in Tun Tavern, Philidelphia, PA on November 10, 1775. The Marine Corps did not adopt "Semper Fidelis" as its motto until 1883.
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Brazilian Marine Corps's motto is 'Adsumus'.
The motto of Atlantis Marine Park is 'Atlantis marine park for the enrichment of mankind'.
Ukrainian Marine Corps's motto is '«ВІРНИЙ ЗАВЖДИ»'.
Netherlands Marine Corps's motto is 'As Far As The World Extends'.
Marine Security Guard's motto is 'In Every Clime and Place'.
Census of Marine Life's motto is 'Making Ocean Life Count'.
Marine Wing Liaison Kadena's motto is 'In the Lead with Support'.
The motto of Marine Corps Systems Command is 'Equipping the warfighters to win.'.
The motto of Philippine Merchant Marine Academy is 'Righteousness, Humility, Courage'.
Troupes de marine's motto is 'And in the name of God, long live the Colonial'.
RAZOR