Written by @Immurement
As Vietnam heated up, the Agency’s need for eyes on the Laotian panhandle increased beyond the support that could be provided by Thai PARU and RTSF advisors. As a result, the CIA was forced to look for other solutions to communicate with its illiterate Lao Theung road watching teams targeting the Ho Chi Minh Trail.
To tackle this problem, the Agency came up with a radio that used pictograms to communicate what a team saw. Crafted from a modified USAF survival unit, the Hark-1 or Hark Box was released early in 1967.
Note the depictions of armor, artillery, AAA, trucks, porters, soldiers, time of day, and direction of travel. The circular button at the center was used to transmit the tally of what was seen moving north and southbound on the trail to an airborne relay station. While the radio doesn’t appear to have a pictogram for elephants, it was given the affection moniker “the Elephant Counter” by Paramilitary Officers involved in the project. To avoid detection, the Hark road watching teams – sometimes numbering up to twenty-four road watchers on a target like the Mu Gia Pass – would be inserted via unmarked “Pony Express” CH-3s very far from their objective.
On the third slide you can see the Hark-1 with antenna deployed in front of Case Officer, Gene Norwinski during a briefing in Savannakhet. The project was wrapped up in 1969 having been overshadowed by a variety of Pentagon projects and new sensors and night vision capabilities like those present on the AC-130.