6-inch artillery.
Pistachio?
The 155mm shell is a 6.1 inch shell. The dark green is a he [high explosive] with different types of fuses on them. [They look like some vt [variable time] fuses] the light green shells are a wp [white phosprous] shell [usally used for marking targets for aircraft attacks] and when in doubt burn them out with willie pete! the orange shells maybe a rap round, it is a lighter weight shell with longer range. In case you reall have to reach out and touch someone! ;)