It's 'a blast from the past'.
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8.These were played in a radio: "And now, here's another blast from the past going out to big Sam who's all alone out with the First Battalion, 35th Infantry there and dedicated by the fire team at An Khe to their groovy CO The Rolling Stones, Satisfaction."
And like all introductions by DJs ('disk jockeys' - the radio presenters who play records [once again, the metaphor has outlasted the technology; today there may be no actual disks involved]), there's not much in the way of syntax and there are lots of abbreviations.
'Big Sam' is the person who has requested the disk; 'going out to' is a not very meaningful way of saying 'broadcast'.
'Their groovy CO' may be a joke. Their CO is their Commanding Officer. As the first words of the song are 'I can't get no satisfaction' (in fact, the name on the original single was '[I can't get no] Satisfaction'). Big Sam may be hoping that his CO is not listening, and that his colleagues will sympathize (and laugh). The song is sung by the group The Rolling Stones.
PS It's a 'blast from the past' because the Stones recorded it in the early sixties. (I remember the record label from my big brother's copy.