The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU01366420
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Civilian Labor Force Participation Rate: Men, Veterans, Gulf War Era I, 18 years and over [LNU01366420], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU01366420/, July 5, 2015.