Every organization has its "A" team and "B" team -- or its first string and second string people. This isn't a subject to be whispered or discussed only behind closed doors. It's something that every volunteer and their managers should face up to in the open. Being on the first string is really a frame of mind, an attitude, and a high commitment to the team and its mission. It is not really a skill level. Many an expert doesn't have the team spirit just mentioned. The ability to progress to a higher skill level is based on a positive and proactive frame of mind. They like their job.
CA State OES began the Bulletins in the early 1950's to assist agencies and radio operators to become more familiar with RACES. They were issued periodically until 1985, at which time they began to be issued weekly over voice and digital radio systems of Amateur Radio and in print. Originally intended for California, increased demand, and a 1988 request by the ARRL for national distribution, led to their eventual worldwide distribution.