My son was 10th Mountain for 3 Iraq tours.
Our USMC Infantry son sent a photo of a thermometer, crazy numbers!
We sent him a gross of chemical ice packs.
He said, they would put them under the helmet and it would only last about a minute!
About 5-10 minutes cold around here.
Oh yes! I remember sending a TON of those ice packs over there! They did love them.
What Battalion was your son in?