The Environmental Test Lab’s Blowing Rain Test Apparatus (BRTA), outfitted with water tubing and placed on a moveable platform, simulates a blowing rainstorm during a test on a Hangar Structure and Outline Light and a Line-Up Light for USS Zumwalt (DDG 1000). The fanboat can produce winds up to 110 miles per hour and 48 inches of rain. (Courtesy photo)