Title; Iron-Blooded Orphans ( Part of the mobile suit gundam series )
Genre (according to Google); Anime, Mecha, Military Science Fiction,
Where to watch; Netflix, Hulu, Crunchyroll, Funimation Now. or you can buy it.
Length; 25 episodes
IBO is one of my favorite animes ever. There is so much action, some sad moments, some happy moments, and just a rollercoaster of emotions. It gets you attached. Its also decently short, so you won't get tired of it, or you can watch it while taking a break from a more extended series!
Warning; There IS quite a bit of blood & fighting