'Grass Week' involves endless hours of 'snapping in' to various firing positions, and staring at targets the recruits will have to wait another week to actually shoot at. The center of this blossom is the end of a .223 shell casing, the civilian version of the 5.56 shells used in training, creating a 3 ring bullseye in anticipation of next week's firing.
The 'Grass Week' Blossom is the 7th flower in the 13 week bouquets, marking the halfway point in Marine recruit training.