Step 1: Recall the Central Administrative Tribunal.
The Central Administrative Tribunal (CAT) was established under the Administrative Tribunals Act, 1985 to adjudicate service-related disputes of central government civilian employees.
Step 2: Identify the exclusion under the Constitution.
Article 323A(1) of the Constitution expressly excludes members of the Armed Forces of the Union from CAT's jurisdiction. Defence personnel have separate service tribunals like the Armed Forces Tribunal for their grievances.
Step 3: Identify the correct answer.
IPS, IAS, and IRS officers fall under CAT's jurisdiction, but officers of the Indian Armed Forces are expressly excluded.
\[ \boxed{\text{Officers of Indian Armed Forces}} \]