We present a complete spectroscopic survey of 2414 2MASS-selected blue horizontal branch ( BHB ) candidates selected over 4300 deg ^ { 2 } of the sky .
We identify 655 BHB stars in this non-kinematically selected sample .
We calculate the luminosity function of field BHB stars and find evidence for very few hot BHB stars in the field .
The BHB stars located at a distance from the Galactic plane |Z| < 4 kpc trace what is clearly a metal-weak thick disk population , with a mean metallicity of [ Fe/H ] = -1.7 , a rotation velocity gradient of dv _ { rot } / d|Z| = -28 \pm 3.4 km s ^ { -1 } in the region |Z| < 6 kpc , and a density scale height of h _ { Z } = 1.26 \pm 0.1 kpc .
The BHB stars located at 5 < |Z| < 9 kpc are a predominantly inner-halo population , with a mean metallicity of [ Fe/H ] = -2.0 and a mean Galactic rotation of -4 \pm 31 km s ^ { -1 } .
We infer the density of halo and thick disk BHB stars is 104 \pm 37 kpc ^ { -3 } near the Sun , and the relative normalization of halo to thick-disk BHB stars is 4 \pm 1 % near the Sun .