Final answer:
The JTR paragraph 033001-B3 refers to the Medical Treatment Facility Incidental Expenses Program, which allows service members to receive the incidental portion of per diem while assigned to a medical unit for duty.
Step-by-step explanation:
Per the Joint Travel Regulations (JTR), paragraph 033001-B3, the program that allows service members to receive the incidental expenses portion of per diem while attached or assigned to a medical/patient unit for duty is known as the Medical Treatment Facility Incidental Expenses Program. This program provides service members with a specific amount designated for incidental expenses, which may include tips and fees for services, such as porters and maids. The intent of this program is to alleviate the financial burden on service members who are receiving medical care or are assigned to a medical treatment facility for an extended period, ensuring they have the requisite support during their assignment or recovery period.