Can be both, got adjustment increments and one off bonuses. Basically if you're at DSTA they will make sure your annual package is well above the mean of the industry. And you will also never be retrenched.

However there's a price to pay for that. Most of my friends complain for years that they don't learn anything substantial there and has no job satisfaction yet continue to stay there.

If you just want a stable comfortable life and can put up with bureaucracy and red tape this is a good place to be at.