Acetone tagging velocimetry (ATV) with nominally 1% mole fraction acetone seeding was conducted in a shock-tunnel-generated hypersonic turbulent boundary layer over a hollow-cylinder-flare at Me=6.05Tw/Tr=0.65Reθ=8925Reτ=408u¯uRMS′y+≈3y+>10y+≈10y+=10, Me=6.05Tw/Tr=0.65Reθ=8925Reτ=408u¯uRMS′y+≈3y+>10y+≈10y+=10, Me=6.05Tw/Tr=0.65Reθ=8925Reτ=408u¯uRMS′y+≈3y+>10y+≈10y+=10, and Me=6.05Tw/Tr=0.65Reθ=8925Reτ=408u¯uRMS′y+≈3y+>10y+≈10y+=10. This single-laser tagging velocimetry experiment measured streamwise velocity and fluctuations, Me=6.05Tw/Tr=0.65Reθ=8925Reτ=408u¯uRMS′y+≈3y+>10y+≈10y+=10 and Me=6.05Tw/Tr=0.65Reθ=8925Reτ=408u¯uRMS′y+≈3y+>10y+≈10y+=10, had a repetition rate of 50 kHz, and did not require the use of an image intensifier. The ATV data are non-dimensionalized via the van Driest transformation and compares well with the literature down to Me=6.05Tw/Tr=0.65Reθ=8925Reτ=408u¯uRMS′y+≈3y+>10y+≈10y+=10; this is into the viscous sublayer. The Morkovin-scaled fluctuations matched the literature for Me=6.05Tw/Tr=0.65Reθ=8925Reτ=408u¯uRMS′y+≈3y+>10y+≈10y+=10; however, below Me=6.05Tw/Tr=0.65Reθ=8925Reτ=408u¯uRMS′y+≈3y+>10y+≈10y+=10, it appears that the noise introduced by the measurement technique, in addition to the velocity differences being small near the wall, rendered the ATV-measured Morkovin-scaled fluctuations below Me=6.05Tw/Tr=0.65Reθ=8925Reτ=408u¯uRMS′y+≈3y+>10y+≈10y+=10 not useful.