Nothing in these rules shall be deemed to affect the right of the Central Government to absorb in the Force, for reasons to be recorded in writing and in exceptional circumstances, a serving Central, or State Government officer on deputation to the Force, where in the opinion of the Central Government such officer has given a creditable account of himself in the post held by him on such deputation for a minimum period of five years, if such deputationist officer has a minimum of three years service left for his attaining the normal age of retirement prescribed for the post held by him.
Provided that on the absorption of such officer in the Force, the period of deputation shall not count for the purpose of seniority or promotion.