In a lot of ways, a lot of PE lyrics are very sloganistic in themselves, in that they're usually just a few simple phrases declaimed strongly. I've always liked the GO track "It's Over", chanting that simple phrase a few times towards the end of the piece.
Actually, the lyrics of G/O's
'It's Over' are lifted from a Roy Orbison song of the same name, with only minor modifications. Someone mentioned it on here some time back, and it can be confirmed by listening to the G/O track while reading along to the Roy Orbison lyrics.
In terms of interpretation of meaning, based on the US army samples and the lyric of
"your 'country' does not 'want' you anymore" (including 'baby' replaced with 'country', and 'love' replaced with 'want'), it is clearly a comment on army veterans being discarded after active service. Perhaps the Roy Orbison lyrics was picked as Roy could be seen to represent a classic image of an American in their heyday. But given everything G/O do is so well thought out, there is obviously a clear reason why - even if it is never stated.