Some specific manuals that would be extremely useful:
TC 3-21.76 Ranger Handbook, April 2017 - https://fas.org/irp/doddir/army/tc3-21-76.pdf
Training Circular 3-22.9 Rifle and Carbine, May 2016 - https://fas.org/irp/doddir/army/tc3-22-9.pdf
FM 3-05.222. Special Forces Sniper Training and Employment, April 2003 - https://archive.org/details/milmanual-fm-3-05.222-special-forces-sniper-training--employment
TC 3-23.35 Pistol, May 2017 - https://fas.org/irp/doddir/army/tc3-23-35.pdf
ATP 3-21.18. Foot Marches, April 2017 - https://fas.org/irp/doddir/army/atp3-21-18.pdf
Comments
A large collection of US army field manuals
https://fas.org/irp/doddir/army/
Some specific manuals that would be extremely useful:
TC 3-21.76 Ranger Handbook, April 2017 - https://fas.org/irp/doddir/army/tc3-21-76.pdf
Training Circular 3-22.9 Rifle and Carbine, May 2016 - https://fas.org/irp/doddir/army/tc3-22-9.pdf
FM 3-05.222. Special Forces Sniper Training and Employment, April 2003 - https://archive.org/details/milmanual-fm-3-05.222-special-forces-sniper-training--employment
TC 3-23.35 Pistol, May 2017 - https://fas.org/irp/doddir/army/tc3-23-35.pdf
ATP 3-21.18. Foot Marches, April 2017 - https://fas.org/irp/doddir/army/atp3-21-18.pdf
https://media.8ch.net/file_store/a6cf40678821452ee12e51659ddbefaa502e0ef31b9eecf871f0abe6c8657ace.pdf