While most likely at least some of these ideas are already by considered by the devs for addition into the game, or even are not even being considered, might as well write up some ideas.
Some clothing/gear assets:
Some Balaclavas:
https://m.media-amazon.com/images/I/511INo4i2GL._AC_UX569_.jpg
https://img.ltwebstatic.com/images3_pi/2021/07/12/162605867916f78f6baac31b25949b666b81f5f621_thumbnail_600x.webp
https://www.ubuy.co.it/productimg/?image=aHR0cHM6Ly9tLm1lZGlhLWFtYXpvbi5jb20vaW1hZ2VzL0kvODErSTRLazAwdUwuX0FDX1VMMTUwMF8uanBn.jpg
Soviet Pilotka:
https://m.media-amazon.com/images/I/31j+AkYw43L._AC_.jpg
Soviet Army Tanker Helmet:
https://thumbs.worthpoint.com/zoom/images1/1/1216/11/soviet-army-tanker-helmet-1989-afghan_1_54f320389b5d3fad780be97f43b106ab.jpg
Russian Ushanka:
https://i0.wp.com/asiatimes.com/wp-content/uploads/2019/12/Christian-Science-Moniitor.png?fit=767%2C470&ssl=1
A version of the FIA M70 Top with the hood up
A Maglite Flashlight for use by FIA forces, the main disadvantage of these ones is that you cannot really clip these on your vest
Weapons:
NATO/US:
AKS-74uG3A3 or FAL
G3A3 or FALM47 Dragon
Kozlice shotgun, with sawn-off variantM47 Dragon
MP5
.44 Revolver
Benelli M3 or Remington Model SP-10
Soviet/Warsaw Pact:
Bizon
Benelli M3 or Remington Model SP-10RPG-29
RPG-29Kozlice shotgun, with sawn-off variant
AS-VAL
M47 DragonAKS-74u
The Czech vz. 58 is another consideration, also apparently there were prototype underbarrel grenade launcher and light support weapons that were never adopted, considering Arma 3 setting a precedent of using prototypes as inspirations, maybe have these IRL unrealised variants available so that the INDFOR/FIA forces have their own specific range of weapons?
Vehicles:
NATO/US:
M113A3 APC
M2 Bradley
M1A1 Abrams
M60 Patton
Bell UH-1 Iroquois
Bell AH-1 Cobra or Boeing AH-64 Apache
Sikorsky UH-60 Black Hawk
Boeing CH-47 Chinook
Warsaw Pact/Soviet:
BMP-2
T-72B
Mil Mi-17
Mi-24A
Mil Mi-26
Like with my other posts, I will be editing this over time with new ideas as I think them