Military Heinlein: About 1924-1930. Because of the way the display was arranged, these photos “read” from left to right. Photos of Heinlein’s family show all seven children about the time he graduated from high school. That thing in the bottom right part of the case is the flag belt he wore for ROTC. Just to the left are pictures from 1924 — the photos are blowups from the book, his high school yearbook.