Why "3K"?

The size

Why is it called 2.5k when it’s larger?

Well.

The game is actually 2.5k large, it’s actually even closer from 2k than 2.5k.

The final executable happens to be 3k because I had to add an intro.

Because Defence Force lost a member this month.

And I could not just let it go like that

Bonus: Plus it will annoy people on Pouet that love to discuss if a 160 bytes Atari production can fit in the 128 bytes long category.