Which of the following sentences uses the correct capitalization?

The correct answer is C. This sentence uses the correct capitalization rules. 'Red Cross' is a proper noun and is capitalized correctly with uppercase letters for both words. The sentence also maintains consistency in capitalizing 'soldiers' as a common noun. Additionally, it uses hyphens appropriately in 'go-between' to link the words. Choices A, B, and D have errors in capitalization. They either do not capitalize 'Cross' or 'Red' correctly, and lack consistency in the capitalization of 'soldiers'. Furthermore, these choices do not consistently use hyphens in 'go-between'. Therefore, choice C is the only sentence that adheres to the correct capitalization rules.