acquisition armored vehicles army army future AUSA 2018 Big Six Combat Vehicles General Dynamics Griffin AFV IFVs infantry fighting vehicles IRAD James Schirmer Land Warfare Mike Peck Next Generation Combat Vehicle NGCV research and development tracked vehicles

2020 budget acquisition allies army Army Chief of Staff army future Army Secretary Association of the US Army AUSA AUSA 2018 BAE Bell Big Six budget Gen. Mark Milley General Dynamics Germany IFVs infantry infantry fighting vehicles Land Warfare M16 rifle M249 Squad Automatic Weapon M4 carbine Mark Esper Next Generation Squad Weapon NGSW Raytheon Rheinmetall Ryan McCarthy Sikorsky small arms