Nah, not normal protocol, just what can happen if you play it right..... Instead of chocolate, I once managed to blag a 10 course meal after a vaccination appointment.
Standing at military attention? Hmmm that suggests you would've rigid and so the muscles could have been rather taught which could've made the injection process that slightly bit more difficult. Personally, I'd try and relax the patient by playing some Al Green, therefore allowing the needle to slip in like a hot knife through butter