Nice to see some old beakies still serving the Emperor.
A note on helmet stripes:
A single color stripe is used for troopers
A single stripe, with two alternating colors denotes veterans. Kinda a hazard stripe look.
Sergeants have two, thinner stripes flanking their helmet stripe, done in a complementary color.
From left to right:
Vet sarge
Sarge
Vet
Trooper
The stripe should extend down the nose, but I never liked that look.