In the sentence, the word ‘retired’ is a participle (specifically a past participle) because it describes the noun ‘officer’.

১. Participles function as adjectives, modifying nouns or pronouns within a sentence.
২. It is not a gerund because it doesn’t function as a noun, and it lacks the properties of an adverb.
৩. Verb forms like ‘retired’, ‘broken’, or ‘excited’ often act as adjectives in English.

অতিরিক্ত তথ্য: A past participle usually indicates a completed state or action.