MPO and MGRR are present in Konami's Metal Gear timeline contained in The Master Collection.

https://preview.redd.it/nqy3kvd09xoe1.png?width=750&format=png&auto=webp&s=6590898c8c22223d5f4dc7d950c2e92621a7c774

https://preview.redd.it/0tehe4e09xoe1.png?width=750&format=png&auto=webp&s=e93c61380ba9a6102a0e4437ec26e696c205e097