Usually an actual national cem will call itself that. This may be local only. Definitely a very small gravesite! But also quite uniform, so not sure.
I’m on mobile and gound two nayion cemetaries but didn’t check the address. Nothing specifically in ‘Somerville’ but step a foot this way or tgat way and you might be back in Boston.
also saw some news articles that police are investigating. Don’t know what they’d charge him with or how diligent they are, I’ve seen criminal vandal violent protesters get cut loose once media attention quieted down.