Final answer:
Selection to the Seaman to Admiral Program leads to the loss of the Basic Allowance for Housing, as STA-21 participants must reside in Navy or college dormitories.
Step-by-step explanation:
Selection to the Seaman to Admiral (STA-21) Program results in the loss of the Basic Allowance for Housing (BAH). The STA-21 program is designed to provide active-duty sailors with the opportunity to go to college and receive training to become commissioned officers. While it's a prestigious opportunity, there are some trade-offs. Participants will receive their full pay and allowances for their current enlisted pay grades, but they do not receive BAH, as they are required to live in Navy or college dormitories.