Final answer:
To be eligible as a US PHS Commissioned Officer in dental hygiene, one must have professional credentials, knowledge of U.S. government and history, and the willingness to take the Oath of Allegiance.
Step-by-step explanation:
To be eligible to become a US PHS (United States Public Health Service) Commissioned Officer as a Dental Hygienist, one must possess certain credentials. These include having the requisite medical qualifications in the field of dental hygiene, a valid license to practice, and relevant work experience.
In addition to the professional credentials, the candidate must have knowledge of U.S. government and history, and be willing and able to take the Oath of Allegiance. This reflects a broader understanding of civic responsibilities and a commitment to uphold the values and duties of a Public Health Service officer, as symbolized by the historical commitment to service in the medical field, demonstrated by pioneers like Robert Tanner Freeman and Ida Gray Nelson Rollins.