A vehicle capable of flight including at least one wing including at least one oscillatory momentum generator mounted therein. The vibration suppressing device includes a cylinder forming a front channel and a rear channel in communication with each other. Upon receipt of a particular sensitive data item from a particular merchant, the RTS identifies one or more reference token pools corresponding to the merchant. A number of extractable snap fasteners extend through associated holes in the housing and engage the sign to retain the sign in an installed condition.