Mildly Interesting

Oh wow! You just unlocked a memory of mine of a M*A*S*H episode where they have to exchange their military scrip from one color to another because of counterfeiting or profiteering or something.

EDIT: Looks like this is the episode- https://mash.fandom.com/wiki/Change_Day_(TV_series_episode)

Found this, which may help

Edit: To save someone the effort, pictured is a series 591, issued 1961-1964 in Cyprus, Iceland, Japan, the Philippines, and South Korea

After making a slightly snide comment, I decided I had to redeem myself by actually finding the answer. It's surprisingly difficult, but the engraver was likely Charles A Brooks. I cannot determine the name or subject of the engraving itself though, though I'm merely using google searching. The answer is probably sitting in some record books in some archive somewhere.

His engravings were nearly photorealistic, so a reverse image search from a cropped pic of just the portrait may yield something--his original source potentially.

Lady liberty. She was also on the backside of dimes before 1950 and some half dollar coins.

I remember seeing this on pawn stars. They said the purpose was to stop black market flows of US dollars into foreign countries. I think it was particularly prevalent in Korea and Vietnam.

What they didn't talk about is what you would do with your stack of certificates when your tour was up and it was time to go home.

Edit: They were convertible to local currency when on leave and US dollars when returning home.

I would bet they were the Chuck E Cheese tokens of the military. 300 more and you can get a plastic snake!