I've read that the US military has looked into small fission generators. They expect logistics to be very difficult near the front if there is a war with a 'near-peer' (China or maybe Russia) and hope to reduce fuel logistics.

I've never heard of them looking into similar fusion reactors. Why would they? Nobody expects to build any kind of production fusion reactor for decades, much less one that could be operated by infantry soldiers and in very difficult conditions - e.g., explosions and people shooting at the reactor.