What is the appropriate term to use when ensuring someone's safety or well-being?

The term "Check on welfare of" is the most appropriate choice when referring to ensuring someone's safety or well-being. This phrase is commonly used in law enforcement and emergency services contexts to signify a proactive measure taken to assess a person's condition and ensure they are safe. It implies a level of concern for the individual and indicates the intention to confirm that they are not in distress or danger, which aligns with the responsibilities of police officers and explorers in community engagement and support.

The other terms do not encapsulate the goal of assessing someone's safety in the same way. For example, "Proceed To" lacks specificity and does not imply any concern for another person's welfare. "Man Down" is typically used in scenarios involving a person who has collapsed or is incapacitated and does not encompass broader concerns about someone's overall well-being. "Security Check" refers more to a security assessment of a location or premises rather than an individual, focusing on property safety rather than interpersonal welfare. Hence, "Check on welfare of" distinctly conveys the intention to ensure that a person's needs are being met and that they are safe.