Link 22 is a secure digital radio link in HF and UHF band, mainly used by military forces. For example, coast guard will use Link 22 as interoperable communication within homeland security. During the late 1980s, NATO, agreeing on the need to improve the performance of Link 11, produced a mission need statement that became the basis for the establishment of the NATO Improved Link Eleven (NILE) Program. This program specified a new tactical message standard in the NATO STANdardization AGreement (STANAG) 5522 to enhance data exchange and provide a new layered communications architecture. This new data link was designated Link 22 by NATO.