Possibly Charms candy. Often done up in a yellow package (with added vitamin C).
See 3rd version of package on this page:
https://www.1944supply.com/assorted-charms.html
Another view of the yellow Charms box here:
https://wwiisupply.com/candies/
Here is a video showing how they were packed.
https://www.youtube.com/watch?v=5TmqzHo_yWk
Charms were probably also available from the PX or issued just as packaged candy (i.e. not in the tins).
There was also an "air crew lunch" that was issued. It was mostly candy, an example is here:
https://www.youtube.com/watch?time_c...&v=JtMte4yguZw