The course description in the below link is (broadly speaking) accurate...
https://en.wikipedia.org/wiki/United...n_and_training
You indicated in your late June 2022 post that your son had (by then) completed Small Unit Tactics & SERE...
Thus, he is now in his MOS Training Phase; specifically the SF Detachment Officer's Course. The training phase that immediately precedes Exercise ROBIN SAGE.
Small Unit Tactics/SERE & the MOS Detachment Officers course are both described in the provided link. That should give you a sense of what he is going through. In Unclassified terms.
Tactical field exercises occur during all three of the SFQC Training Phases I just mentioned. Essentially, his tactical training is about learning and practicing both light infantry & guerrilla warfare skills.
Good Luck to your Son.
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