That’s a neat but false story. Indeed the Army introduced a stress management card in BCT about 15 years ago, along with BRM, Drill and Ceremony etc.
The idea that trainees are given a “time out” is pure fabrication.
Anyhow, how would your USMC son know what the Army issues to trainees or does in BCT?
Sorry....
because his best friend joined the Army the same time my son joined the Marines, and he said they have stress cards which they produce when feeling stressed once a week, and can have a time out to de-stress.. It is also widely known if you talk to the younger crowd.