Okinawa yakisoba is a little different then regular Japanese yakisoba. Typically the thicker noodles are used, and depending on the place it will be either salt style 塩 or sauce style ソース; there is also a ketchup based style (gross). Another difference is in the meats: usually spam is a popular choice, although often it will be a mix of spam and the same kind of pork they use in regular Okinawan soba. I do not eat meats so I give them to my husband or order without.
It is definitely junk food, and not so great for you, but with an ice cold Orion, it hits the spot. It is a popular choice with foreigners at the local shokudo 食堂 in Okinawa.