Due to physical fitness/ability, education, criminal records, or intellect, only 15% are eligible to serve. I would guess only 3% of them would elect to do so.
Currently, 0.5% of the population is serving. This contrasts with World War II, where 8.5% of the entire populace served.
Nationally, only 1% (as you stated) have served. The ranks of former military who serve in the House or Senate is at an all-time low. I can't remember this number exactly, but I think it was 15%.
The article I read stated that never before in America's history has society been so isolated from the military----and vice-versa.
Pretty sure I read it in Newsweek.