From one set of 1718 personnel who had or currently worked within the facilities, 246 of them said they'd seen something that required a check in with the Defence Force psychology team, and another 22 asked for a psychologist's help.
Of the set of 1718, 15.6 per cent said they'd experienced challenging situations while doing the job.
From those who responded to the Well-being Questionnaire, almost 10 per cent met Defence's threshold for support. And 161 of that group scored at a level where the Defence Force felt psychological support or a check-in was warranted.
A further 18 people asked for a psychologist to contact them to discuss their response or the experience.
Air Commodore AJ Woods said the responses were at expected levels.
"These figures are similar to the average for operation debriefs; 15 per cent of deployed personnel require additional follow-up."
Woods said that by 20 November, 13 people had decided to leave the Defence Force from the first cycle of 427 staff who were assigned to Operation Protect, including four who had already left.
However, the Defence Force said drawing a direct link between the decision to leave and their service in Operation Protect would be unsound.
- RNZ