Rear Admiral Steer said sending 300 redundancy letters was "one of the hardest things we've done in a very long time", and staff were suffering from "change fatigue".
"It was damaging because our people felt we let them down, that we weren't looking after them, that we broke the social contract."
The attrition rate was 19 per cent - 685 roles were vacated between August 2011 and January 2012 - and staff morale was at its lowest since the Defence Force surveys began eight years ago.
The force is actively recruiting personnel from overseas, including the United Kingdom, though a Defence Force spokesman said this was not a new process.
Rear Admiral Steer said the "trauma" of the first round meant there will be no redundancies in the second round, which will consider 130 specialist positions.
"We will be using natural attrition and end of contracts to get the numbers down. Given our challenge with attrition at the moment, I don't see a further phase of civilianisation, because it's just too damaging at the moment.
"What we need to do is stabilise our attrition, improve our morale and then reassess where we stand."
His comments appeared to catch Dr Coleman off guard.
"No final decisions have been made on that second tranche of civilianisation. I'll have to see what [Rear Admiral Steer] has said, but no final decisions have been made."
He said he did not think the Defence Force had been pushed too far.
"There have been high attrition rates, but at the same time there have been people lining up out the door to join the Defence Force.
"Overall I think it's gone pretty well."
Under questioning in the committee from Labour MP Phil Goff, Rear Admiral Steer revealed two navy officers had been made redundant and were rehired; one was on an evaluation team, the other head of the youth development unit.
"You could say we made a mistake," he said.
Defence Force staff had effectively had a wage freeze for almost four years, and Rear Admiral Steer said that could not continue if they wanted to retain the best staff.
"There's still a long way to go. Am I confident of making $355 million [by 2014/15]? Yes. Will it be easy? Definitely not."