When in university, I took part in a CUBEsat effort. I brought the mechanical assembly -no electronics, just the aluminium structure- of our satellite to CalPo

When in university, I took part in a CUBEsat effort. I brought the mechanical assembly -no electronics, just the aluminium structure- of our satellite to CalPoly for a CUBEsat workshop; on the way back to Europe I found out the hard way that anything which goes into space is considered munitions as far as the US DoD is concerned. Took a while longer than expected to get on my flight...