Years	Decal	Shell	Mask	Stripes L to R	Stripe Width
?-1953-1954	blue, textured horns	white	none	gray
?-1962	none	silver? or gold?	gray	none
1963-1965	interlocked navy NC w/ black ol	white	gray	navy/ blue/ navy	1/4"- 1/2"- 1/4"
1966-1977	interlocked lt.blue NC inside white oval w/ thin navy ol	lt. blue	gray	white	1/2"
1978-?	large, interlocked, white "NC" w/ thin navy ol	lt. blue	gray	navy/ white/ navy	1/4"- 1/2"- 1/4"
?-1981-1983-?	UNC in diagonal slant w/ navy ol	lt blue	white	navy/ white/ navy/columbia/ navy/ white/ navy	1/8"-1/4"-1/8"-1/2"- 1/8"-1/4"-1/8"
?-1986-1987	UNC in diagonal slant w/ navy ol	lt. blue	navy	navy/ white/ columbia/ white/ navy	1/8"- 1/4"- 1/2"- 1/4"- 1/8"
1988-1994*	white NC interlocked w/ thin navy ol	columbia	white	navy/white/navy	1/4"-1/2"-1/4"
1995-2000	white NC interlocked w/ thick navy ol	columbia	white	navy/white/navy	1/2"-1/2"-1/2"
2001-current*	white NC interlocked w/ thin navy ol	columbia	white	nav/ white/ navy	1/4"-1/2"-1/4"

Notes:
*- same helmet design

UNC 1954	UNC 1962	UNC 1965*	UNC 1972
UNC 1978	UNC 1981	UNC 1987	UNC 1994
UNC 1997	UNC 2001