Final answer:
The MSC IPP applicants must not have reached their 42nd birthday by the time of initial appointment and commissioning. Age is an important eligibility criterion for potential candidates for commissioning in the Medical Service Corps.
Step-by-step explanation:
The MSC IPP (Medical Service Corps In-Service Procurement Program) has specific age requirements for its applicants. Those who wish to apply must not have reached their 42nd birthday by the time of initial appointment and commissioning. This age limitation ensures that applicants have the potential for a sufficiently long service career. It is important for applicants to explain in their application if they meet this requirement, as it is one of the eligibility criteria used to assess potential candidates for commissioning in the MSC.