Tactical decision making in the air combat environment requires the ra
pid processing of large amounts of data in a complex and unpredictable
environment. To investigate decision making in this domain, we conduc
ted a study in which 10 experienced fighter pilots provided tactical d
ecisions and performed a target replacement task on a tactical situati
on display showing a wide variety of tactical situations based on the
de Groot memory paradigm. Results were analyzed to determine features
related to pilot attention distribution in processing tactical situati
on displays and their correspondence to tactical decision making. Evid
ence is provided for the effect of target quantity, target location, a
nd overall target density distribution on decision making and attentio
n. In addition, substantial variation in decision making was found bet
ween participants. Systematic biases in attention were also discovered
which have implications for decision making in combat situations. Evi
dence of chunking in processing the displays was also explored. Result
s indicate that although pilots appeared to chunk targets in a manner
similar to experts studied in other fields, the criterion used for det
ermining chunking in these studies may not be valid.