How should you address a foreign military member if uncertain about their rank?

In a situation where you are unsure of a foreign military member's rank, addressing them as "Sir" or "Ma'am" is appropriate and respectful. This form of address is universally recognized in military settings as a sign of respect, regardless of the specific ranks and structures of different countries' military organizations. It avoids potential faux pas that could arise from incorrectly assuming or misidentifying someone's rank, thereby fostering a positive and respectful interaction. This practice emphasizes professionalism and courtesy when engaging with military personnel from diverse backgrounds and ranks.