The passage does not mention the last trump. I get that you personally infer the connection, but it seems disengenous to clam "the passage indicates it".
Let's try and get on the same page then. What I was responding to is in regards to1 Corinthians 15:55-56 you brought up. Here are those verses below. And then I pointed out that--afterward they that are Christ's at his coming(1 Corinthians 15:23)---this is meaning during the last trump.
1 Corinthians 15:55 O death, where is thy sting? O grave, where is thy victory?
56 The sting of death is sin; and the strength of sin is the law.
And here are these verses in context.
1 Corinthians 15:51 ¶Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,
52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
53 For this corruptible must put on incorruption, and this mortal must put on immortality.
54 So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.
55 O death, where is thy sting? O grave, where is thy victory?
56 The sting of death is sin; and the strength of sin is the law.
57 But thanks be to God, which giveth us the victory through our Lord Jesus Christ.
Which is then why I indicated this passage involves the last trump. First we are told this in verse 52---In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
Then in the verses you supplied, we are told this a verse earlier---So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory. But Paul didn't stop there. He went on to say---O death, where is thy sting? O grave, where is thy victory? The sting of death is sin; and the strength of sin is the law. But thanks be to God, which giveth us the victory through our Lord Jesus Christ--thus connecting with these earlier verses, 51-54.
Verse 53 tells us---For this corruptible must put on incorruption, and this mortal must put on immortality. And that verses 54-56 tell us once this is accomplished, then shall be brought to pass the saying that is written, Death is swallowed up in victory. Where it appears Paul is likely quoting from Isaiah 25.
And that verse 52 tells us when these things are accomplished---In a moment, in the twinkling of an eye, at the last trump
The reason why death is swallowed up in victory at the last trump is because instead of remaining bodily dead, one becomes bodily alive again, this time for forever. But in this context this is only being applied to the saved and not the lost as well, since it would be ludicrous to apply verse 57 to the lost that are going to be cast into the LOF eventually. As if it makes sense that anyone that will get cast into the LOF, they are grateful to God for this, and that this gives them victory through Lord Jesus Christ.