legionnaire, Legionnaires’ disease

In general, use lower case for a member of a legion, such as the Royal Canadian Legion.

• The legionnaires paraded on Remembrance Day.

In American texts, the L is usually capitalized in the name Legionnaires’ disease. However, lower case is often used in Canada and Britain. Note the apostrophe at the end of Legionnaires’.

• The first recognized cases of Legionnaires’ disease occurred in Philadelphia.
• An outbreak of legionnaires’ disease claimed two lives recently in Quebec.

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