Owl Computing Technologies was created in 1998 to offer One-Way Transfer Links (OWL). Their latest implementation is their dual diode technology.
They use a hardened security infrastructure (card) to share data one-way, across domains, for example, low-side to high-side. It takes the old, copy to external disc, air gap, out of the equation, lowering risk to unauthorized disclosure of data via errant USB thumb drives. It also makes for faster access to data from different networks for analysis and fusion.
At the Soldier level, it ensures only certain information to be shared via a network such as heart rate monitor telemetry, GPS data or video. Other data streams could be shared via other networks.