UPDATE: This video is making the rounds on FB, again, so, I figured I’d repost it.
Original Post March 2017: Listed as a 1940s promotional film, the inclusion of CJ-5s and the exclusion of DJs and FCs suggests to me it was created in 1955. There’s an extended look at a cargo personnel carrier near the end of the video There are also a variety of specialized equipment and hardtops shown.