Based upon my experiences performing security cooperation duties in the Military Assistance Program (MAP) in Jordan, at a GCC, and at DISAM, I offer some thoughts and comments concerning the SDO/DATT concept.
No. Barley is not wheat at all. Barley and wheat are two different species of cereal grasses belonging to the family Triticeae. Barley does belong in the wheat family, which is, as mentioned, Triticeae, but is of an entirely different species from wheat. The species name for barley is Hordeum vulgare, and the species name for wheat is Triticum aestivum. No doubt either look similar, but both are quite different from the other.
The second largest crop grown in the US is soybeans. As with corn, soybeans are primarily grown in the Midwestern states. The US barley crop is of most interest to Canadian malt barley growers. US barley is grown over a wide area geographically and the US produces about 60 per cent as much barley as Canada.