In Evelyn Waugh's Loved Ones, there is a sentence: Mrs Komstock had...a nephew who was high in indoctrination:
Wars simply don’t interest me. Everyone’s like that now. Well, I was like that in ’43. So I went to the Beverly-Waldorf and worked in the beauty parlor, but you couldn’t really get away from the war even there. The ladies didn’t seem to have a mind for anything higher than pattern-bombing. There was one lady who was worse than any of them, called Mrs. Komstock. She came every Saturday morning for a blue rinse and set and I seemed to take her fancy; she always asked for me; no one else would do, but she never tipped me more than a quarter. Mrs. Komstock had one son in Washington and one in Delhi, a grand-daughter in Italy and a nephew who was high in indoctrination and I had to hear everything about them all until it got so I dreaded Saturday mornings more than any day in the week.
What's the meaning of "be high in indoctrination"?