What designation represents the health professional pay entry date?

The designation that represents the health professional pay entry date is "HP." This designation specifically indicates that an officer is a member of the Health Professional Corps, which includes various health care providers such as doctors, nurses, and dental officers within the Navy. The pay entry date for these health professionals is critical as it influences their pay and benefits, including special pays and bonuses that are often tied to their service and qualifications within the health sector.

Understanding the "HP" designation is essential for recognizing how the Navy compensates its health professionals, especially since they play a vital role in maintaining the health and readiness of Navy personnel. The other designations do not specifically pertain to health professionals or their respective pay entry dates, making "HP" the accurate choice for this question.