In some embodiments, a system may include a first wearable harness worn, during use, on a torso of a subject. The system may include a second wearable harness worn, during use, on a torso of a subject on an outer surface of the first wearable harness. The system may include a plurality of engines which when activated apply an oscillation force to at least one treatment area. At least one of the plurality of engines may be releasably couplable to the first wearable harness using a positioning system such that the oscillation force is applied to the treatment areas. The oscillation force may mobilize, during use, at least some secretions in an airway within the subject at least adjacent the treatment area. The second wearable harness, when activated, may provide a compressive force to at least some of the activated plurality of engines positioned above the treatment area.