From Gear Patrol:

“To create the MACV-1, McCarthy assembled a three-man team that included himself, footwear designer and inventor of the Reebok Pump Paul Litchfield, and Richard Rice, a 30-year Special Forces veteran. Price’s military experience includes time served in Vietnam as a member of MACV-SOG, a classified special ops unit charged with undertaking many of the war’s most sensitive and dangerous missions.”

Read more here.