Final answer:
The direct supervisor should be the rater on a Petty Officer's (E-5-E-6) evaluation. An expressive leader, capable of fostering harmony and morale, is best exemplified by the director of a summer camp for chronically ill children.
Step-by-step explanation:
In the context of military performance evaluations, specifically for a Petty Officer (E-5 to E-6), their performance is usually assessed by their direct supervisor. As a form of 360-degree performance appraisal, this approach incorporates feedback from a range of individuals within the organization. However, the most appropriate person to carry out the evaluation is the one who works closely with the Petty Officer on a day-to-day basis and can provide the most accurate assessment of their performance and capabilities.
Regarding the question of who is more likely to be an expressive leader, the characteristics of an expressive leader suggest they are focused on maintaining the group's harmony and morale. Taking into consideration the given options, the director of a summer camp for chronically ill children is the one who seems to fit the role of an expressive leader the best. This is due to the high level of emotional intelligence, compassion, and interpersonal skills required to create a positive, supportive environment for the children, in addition to the organizational skills needed to run the camp.