Engine fan running a lot

[zr2yz125]

Is it normal for the engine fan on an M1123 to engage while driving on flat ground? Doing 45mph on a relatively flat (for Tennessee) road and the engine fan engages for a few minutes then shuts off for about 2x longer than it was engaged.

I’m asking as my Chevy diesel pickup truck only engages the engine fan if I’m towing something heavy.

 

[diesel_dave]

This is either normal or my truck is broken too

 

[Mogman]

Normal, the HMMWV does not draft through the stack as well as your pickup

 

[zr2yz125]

Normal, the HMMWV does not draft through the stack as well as your pickup

That is what I figured. The large mesh under the grille can't be helping anything either...It's like a snow fence, for your grille!