This is the Douglas A3D Skywarrior. If you want to know more about it, watch this video:
(Or you could just go and look on Wikipedia)
Yes you do need mods. Those mods are:
BD armoury: https://kerbalstuff.com/mod/90/BahamutoD's Armory
Adjustable landing gear: https://kerbalstuff.com/mod/321/Adjustable Landing Gear
B9 Aerospace Procedural Parts: https://kerbalstuff.com/mod/515/B9 Aerospace Procedural Parts
Kerbinov: http://www.curse.com/ksp-mods/kerbal/220999-kerbonov-parts-pack