Name a common service uniform worn by RAF personnel.

The No. 1 Dress and No. 2 Dress are designated uniforms worn by RAF personnel that serve specific purposes based on occasion and formality. The No. 1 Dress is typically the most formal uniform, worn for ceremonial events, parades, and official functions. It features a tunic and trousers, often adorned with medals and insignia, reflecting the rank and service of the individual. The No. 2 Dress is slightly less formal and is commonly used for day-to-day duties and non-ceremonial events. Both uniforms are critical for maintaining a professional appearance and ensuring that personnel are easily identifiable during formal occasions.

In contrast, combat fatigues are utilized mainly for operational duties and activities where practicality and functionality are paramount, thus not aligning with the question of common service uniforms used in formal contexts. Ceremonial robes, while being specific to certain occasions, do not constitute a standard service uniform across the RAF. Casual attire does not represent an official uniform and is not authorized for service use. Hence, the designation of the No. 1 Dress and No. 2 Dress as common service uniforms is based on their formal recognition and usage within the RAF structure.