How did the Apollo astronauts get life insurance? Well, they didn’t. So they made their own according to Collectors Weekly:
The so-called “insurance” postal covers from Apollo 11 are a safe way of acquiring the crew’s autographs. As Buzz Aldrin has explained, “Since we were unable to obtain adequate life insurance due to the high risk nature of being an astronaut, we signed this group of covers and evenly distributed them to our families for safe keeping while we performed our mission. If an unfortunate event prevented our safe return, the covers would have provided a limited financial means of support to our families.”
This is really a clever approach if you think about it.