Assessment of Chiropractic Treatment Using Reaction and Response Times in Members of the Special Operation Forces (ACT2)

Inclusion Criteria: * Age range at least 20 years of age * Written informed consent * Active duty SFQ personnel or Special Operation Forces who are part of the 160th SOAR regiment on flight status stationed at the Ft. Campbell, KY military site Exclusion Criteria: * Pain Intensity (NIH's PROMIS- question #29) \> 4 at the Initial Visit * Additional diagnostic procedure needed (e.g. x-ray) * Bone and joint pathology contraindications for CMT. Potential participants with recent spinal fracture, concurrent spinal or paraspinal tumor(s), spinal or paraspinal infection(s), inflammatory arthropathies and significant osteoporosis will be referred for appropriate care. * Other contraindications for CMT (i.e., unstable spinal segments, cauda equina syndrome) * Currently being treated for traumatic brain injury (TBI) * Reasonable chance that within 2-4 weeks of initial participation they may be unable to complete the study, i.e., deployment, receive orders for a distant duty assignment or training site or otherwise be absent from the current military site over the study participation period. * Received care from a Doctor of Chiropractic within the past 30 days. * Pregnant or planning to become pregnant within 4 weeks.