Some ETUs were built by non-governmental organizations with their own schematics. Others were planned by the U.S. Department of Defense according to strict instructions. That is one of the quirks of most ETUs: because the crisis is so new, the designers didn’t have the experience with Ebola that the facility operators do. Take Heart to Heart’s site, for example. The Tappita ETU started as a lush green field dotted with banana trees. Then, engineers from the U.S. Army and construction contractors plowed through with bulldozers to lay a foundation. Over the next month, they raised up buildings and tents, (tried to) dig wells, installed water tanks and plumbing, and covered the ground with chunky gravel. They trucked in materials for carpentry and electrical wiring from the capital Monrovia, a 11–12 hour journey over spine-jarring dirt roads. When those roads turned to sludge during rainy season, Chinook helicopters flew in the materials.