  The Third Catalog of Hard Fermi Large Area Telescope Sources (3FHL) reports
the detection of 1556 objects at E > 10 GeV. However, 177 sources remain
unassociated and 23 are associated with a ROSAT X-ray detection of unknown
origin. Pointed X-ray observations were conducted on 30 of these unassociated
and unknown sources with Swift-XRT. A bright X-ray source counterpart was
detected in 21 out of 30 fields. In five of these 21 fields, we detected more
than one X-ray counterpart, totaling 26 X-ray sources analyzed. Multiwavelength
data was compiled for each X-ray source detected. We find that 21 out of the 26
X-ray sources detected display the multiwavelength properties of blazars, while
one X-ray source displays the characteristics of a Galactic source. Using
trained decision tree, random forest, and support vector machine models, we
predict all 21 blazar counterpart candidates to be BL Lacertae objects (BL
Lacs). This is in agreement with BL Lacs being the most populous source class
in the 3FHL.
