Poets of the Fall are a real-life band that also exist in the Alan Wake universe. Although lots of things are known about them in real-life almost nothing is known about them in the Alan Wake universe. There are seen on the Harry Garrett show with Sam Lake and Alan Wake. Pat Maine mentions on a radio show that they remind him of local talent, the Old Gods of Asgard, this is an easter egg as they are both performed by the real-life band.
For more detail of the military information click here.