Again, depends on terrain, cover (or lack thereof) and so forth. Sometimes its best to drop to your belly and return fire; other times its aholes and elbows firing every so many steps to provide some covering fire.
Or pop a grenade if possible.
IMHO, a CCW situation won't be much different, other than the cyclic firing rates - probably not against automatic fire, skill of the OPFOR probably isn't that great, etc.
The fact that the opfor is on their belly and firing into a well-defined firing lane can make dropping on the spot the best answer. Especxially if you have smoke grenades, as this can take a couple of secs to deploy.
Not a bad idea to A) practice both and B) have a plan as you enter the area just in case. And good COMMs.
The Way of the warrior is to master the virtue of his weapons
This is the truth: when you sacrifice your life, you must make fullest use of your weaponry. It is false not to do so, and to die with a weapon yet undrawn. - Miyamoto Musashi
Shot placement may be king, but capacity is the prime minister. - garrettwc
Ehre über alles! Author unknown
Two roads diverged in a wood [a]nd I took the one less traveled by; And that has made all the difference - Robert Frost