Best way to track defence contractor brand perception over time?

For procurement teams specifically, I'd combine a short pulse survey (quarterly, 10-15 questions max) with ongoing social/media monitoring using something like Brandwatch or Meltwater to catch sentiment shifts between survey waves. The tricky part with defence is low respondent numbers, so make sure you're tracking directional trends rather than obsessing over statistical significance. If you can get even 30-40 procurement contacts per wave, that's workable.