Final answer:
MSC IPP applicants without a current ENTNAC or NAC need to fill out the Standard Form 86 (SF-86) for a background check to obtain necessary security clearance.
Step-by-step explanation:
The form required for all Medical Service Corps In-Service Procurement Program (MSC IPP) applicants who do not possess a current Entrance National Agency Check (ENTNAC) or a National Agency Check (NAC) is the Standard Form 86 (SF-86), also known as the Questionnaire for National Security Positions. This comprehensive form is used to conduct background checks and is a crucial step in obtaining the necessary security clearance for service personnel.
Applicants must complete this form accurately and in its entirety to provide the information needed for their background investigation. Failure to possess a current ENTNAC or NAC will require the completion of the SF-86 to ensure that all appropriate security checks are conducted before one can fully engage in MSC IPP activities.