Nope, it´s something like an animation log book.
Btw, I just checked back and found out who Mashikaku is. It´s the dude officer that always hangs around Smoker and Tashigi. His first appearance was in chapter 98 (just like Smoker and Tashigi did) and he also was in Arabasta. It was him who tried to convince Tashigi that it was a perfect chance to capture beat up Strawhat pirates in chapter 212.
The other two guys however will be tough to find because they don´t ring any bells for me. Judging by the art style I´d say that the one next to Tashigi appeared later down the story.
Btw, what does the box say about Pudding Pudding, Nezumi and Ripper? It seems that they aren´t Marines anymore. For Pudding Pudding and Ripper this makes sense since they´ve both been finished off but last time we saw Nezumi he was very much alive and still a Marine. Or does it say that they don´t fall under HQ Marines?