Altering a barcode is information corruption. Reformatting someone's hard drive is information destruction. Corruption covers the spectrum from subtle alteration to thorough destruction. A SOF team dropping a powerful magnet on a hard disk is an example of information attack. Observation converts phenomena into data.
Orientation processes the data into information.
Decide converts the information into orders. Act converts the orders into action. The OODA loop is continuous-as you act you observe the results, starting the process all over again. Land, sea, air, and space are realms within which we may conduct military operations. Each realm imposes its characteristics on operations within it.