Since we’re talking about E=m(c squared), in theory the bacon’s mass would be interchangeable with the mass of anything else. I’m doubtful that calories are relevant to niclear fission or fusion, though I could certainly be wrong.
But there must be some kind of efficiency factor based on the methodology of conversion and the material being fissioned or fused.
Correction: They’d likely fire at it with an anti-ballistic missile missile. But since the bacon doesn’t have any transponders for them to home in on, they’d probably miss.