'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 pewter center of this blossom shows crossed rifles, a long-standing symbol of America's infantry.
The 'Grass Week' Blossom is the 7th flower in the 13 week bouquets, marking the halfway point in Marine recruit training.