I have never been offered a contract when hired anywhere in the US -- well except for the Army. An offer letter is not a contract, often it says so in the offer

I have never been offered a contract when hired anywhere in the US -- well except for the Army. An offer letter is not a contract, often it says so in the offer letter near where it says you are an at-will employee that they can fire for any reason at any time. I had a guy leave after a few months because the big company he really wanted to work at finally came through with an offer. I wished him well and was happy for him.