In a compound noun with a postpositive adjective, such as "Director-General" or "Court Martial," the noun is pluralized by using the plural form of the first word (i.e. "Directors-General" or "Courts Martial").
Question:
How are possessive forms of both the singular and plural compound nouns formed?
Answer formats:
Please include the "Director-General" and "Court Martial" example in your response.