These documents are examples of the military draft documents that all young men were required to have in the 1960s.
The Registration Certificate for Charles Spurgeon is an example of the “draft card” that was meant to be carried in a wallet. This is the card that was sometimes publicly burnt as part of protests against the war.
The Student Certificate for Leon Vinci is the form required to apply for a student deferment to the draft.
The memo from the local draft board to Michael Kaloyanides was a notification that Michael would not be called up for service since his lottery number of 98 was higher than the cutoff number of 95. The draft lottery was instituted in 1969, and in this case anyone assigned a number of 95 or lower would be called for military service and very likely sent to Vietnam.