Picatinny Arsenal
（重定向自Picatinny）
![Officers' quarters, Lake Denmark, July 1926](/Images/godic/202502/02/Exp_acc_shkwv_denmark_lng_20060324_1_02528.jpg")
![A 215-foot grey metal tower is used for munitions testing and weather research by Picatinny Arsenal Precision Armaments Laboratory.](/Images/godic/202502/02/Picatinny_Arsenal_Tower_Jefferson_Township_NJ2528.jpg")
The Picatinny Arsenal (/ˈpɪkətɪni/ or /ˌpɪkəˈtɪni/) is an American military research and manufacturing facility located on 6,400 acres (26 km) of land in Jefferson Township and Rockaway Township in Morris County, New Jersey, United States, encompassing Picatinny Lake and Lake Denmark. The Arsenal is the headquarters of the United States Army Armament Research, Development and Engineering Center. It is known for inventing the ubiquitous Picatinny rail, as well as being the army's center of expertise for small arms cartridge ammunition.