I was trained as Armored Recon. Served with the 17th Cav while with the 101st Airborne. But I must have undergone retraining on the flight to Viet Nam because upon landing I was reclassified as Infantry and sent as a replacement to the 1st/503rd Infantry Battalion 173rd Airborne. I spent a year OJT in Infantry, and upon reassignment found myself back in Armor Recon with the 82nd Airborne.
Hope this answers your question.