The Nasu (acronym for Nauha-Sisu , also meaning "Piglet" in Finnish) is a tracked articulated, all-terrain transport vehicle developed by Sisu Auto for the Finnish Army. It consists of two units, with all four tracks powered. It can carry up to 17 people, although the trailer unit can be adapted for different applications (see Variants section). There are two main versions, the NA-140 BT and the NA-110. The Nasu was tested in 1985, and the next year 11 pre-production units were ordered. Since then, more than five hundred have been manufactured to equip the armies of China, Turkey and Finland.