UK forces have been in Afghanistan since US-led forces launched Operation Enduring Freedom in 2001, targeting al-Qaeda and its Taliban supporters. As the UK's role has changed, troop numbers have increased.
Definition of systematic. 1 : relating to or consisting of a system. 2 : presented or formulated as a coherent body of ideas or principles systematic thought. 3a : methodical in procedure or plan a systematic approach a systematic scholarb : marked by thoroughness and regularity systematic efforts.
The arrangement or classification of objects according to certain criteria. Systematics is a broader term applied to all comparative biology, including taxonomy. For classifying plants and animals, where the term taxonomy is most often applied, the criteria are characters of structure and function. A given character usually has two or more states.