Yemen

From 1962-1970 Yemen was divided into two by civil war with republicans against royalists. Both sides issued stamps. By 1968 the republicans had more or less won so these stamps were the last hurrah for the royalists (The Mutawakelite Kingdom of Yemen)

1969: History of Outer Space Exploration

The depiction of Apollo 12 landing on the moon made an appearance on this, a sort of miniature sheet meets stamp (giant envelope required). Apollo 12 landed near the Ocean of Storms, an appropriate choice in retrospect, for the mission is remembered for the rocket surviving two lightning strikes during launch.

Here is Apollo 12 launching on 14th November 1969. The three US presidents appear in the sky on the stamp and one of them, Richard Nixon, became the first incumbent president to attend a rocket launch.

The first man to exit the lunar module Intrepid was Pete Conrad who would later command the first space mission to the space station Skylab which involved him taking many tricky spacewalks to tinker with the space station which had been badly damaged at launch.

The lunar module touched down with little fuel to spare near Surveyor 3, a robotic spacecraft that had landed on the moon two years earlier which I think is portrayed on this stamp  -

with the other member of the of the lunar landing, Alan Bean, who quipped "Don't come to the moon without a hammer" when his companion Conrad struggled with deploying a nuclear-powered experiment package and as a last resort hit it with a hammer.

The other member of the team whose name appears on one of my favourite NASA mission badges was the command module pilot Richard 'Dick' Gordon.

The Lunar New Year of the Pig provides another letter Y this week here

Sunday Stamps II prompt of the Letter Y - for Yemen and year - See It On A Postcard