Final answer:
In a homeless shelter, the Medical Officer is most likely to be delegated as the Impairment Coordinator due to their medical expertise and responsibility for addressing health-related issues.
Step-by-step explanation:
In a homeless shelter, the individual most likely to be delegated as the Impairment Coordinator would be the Medical Officer. This role typically involves assessing and addressing the medical needs and disabilities of residents within the shelter environment. While a Shelter Manager oversees general operations and a Security Guard ensures safety, the Medical Officer has the specific training and expertise needed to manage health-related issues, making them the most suitable choice for this position. The Fire Guard would have responsibilities more closely aligned with fire safety rather than the medical care of residents.