I have just finished watching an Amazon Prime program called "The Man Left Behind" about Paul Longgrear, a retired SF Colonel, and an SF Hatchet Force commander at Lang Vei near Khe Sanh.
There is a little bit of a spiritual/religious undertone, but not too much. Longgrear meets with a retired NVA Col. who participated in the battle, and there are a lot of details of the siege in the show. Very interesting! John Plaster talks of this battle in his book SOG.