Here's a dictionary on what some words will mean and some acronyms explained, I do warn you though this is very... Approximate. If you guys are interested in more difficult terms I can make diagrams to explain.
Wank = Shit
PRR = Personal Role Radio (Basically a walkie-talkie)
Fives and Twenties = Closely interrogate the ground and surrounding area around you within five meters first, then once you've completed your Fives you begin to inspect your Twenties. You are looking for things like Aiming markers or disturbed ground.
Aiming markers = The corner of a street, a bit of trash on the ground that is oddly bright coloured, a rag, stacked stones, anything that gives anyone an idea of your direction and distance.
IED = Improvised Explosive Device (a bomb)
VBIED = Vehicle Borne Improvised Explosive Device (basically a bomb in a car you drive into people then detonate)
VHF = Very High Frequency (A type of frequency band used in radio communications)
One I.C or 1IC = First In Command
Two I.C or 2IC = Second In Command
Go Firm = Find somewhere with cover and don’t give ground.
Trigger Mechanism Housing or TMH = The working parts in a weapon, the levers, springs, trigger mechanism, recoil spring, etc.
Contact Report = Sending over the radio that you are under effective enemy fire. Effective meaning shots in and around your position aimed at you.
ETA = Estimated Time of Arrival
RPG = Rocket Propelled Grenade, the most famous version of this is the RPG-7.
Dicker = Usually an unarmed scout informing hostile forces of your position.
Squad = 8 - 12 men
Platoon = 2 - 4 squads
Company = 1 - 4 platoons
Battalion = ^ same idea
Reveille = When soldiers are meant to wake up for work.
Moonstate = A term associated with the Orders process, detailing the moon on how much moonlight you can expect on night operations if the weather stays clear. (it never stays clear).
Orders = How the person in charge plans to conduct the operation, outlining various topics as friendly, enemy, and civilian forces that may be within operational boundaries and countless other parts of useless drivel.
H-Hour = The final hour you have to prepare when you are about to attack the enemy, I’m not entirely sure what the H stands for, some people have called it Happy Hour. You would do things like a final kit check, such as ammunition, that everyone knows their roles and what is supposed to be undertaken. If in the field you would pack up and hide your equipment.
Downrange - if at a range then it means at the targets, if in combat it means towards the enemy, the enemy is always downrange but in combat, it is also known as the ‘two-way range’.
MFD = Multi-function displays, used in aircraft to give readouts.
Stick = Single-use disposable launcher.
Stick = Could also mean joystick, control, flight stick for aircraft be aware of context used to discern the differences.
Joystick = Euphaneism.
MG = Machine gun
Civpop = civilian population
Tango 1/2/3 = T 1/2/3 = Triage level 1/2/3 = Triage 1 is a catastrophic bleed, not breathing, unconscious, anything that will kill you very quickly. Triage 2 would be someone who is injured but unable to walk, unable to continue to fight without medical attention, like a broken leg, but is alert and talking. Triage 3 is the famous walking wounded, you’ve fractured your arm, you’ve received light burns. You need stitches etc.
Direction Found/Find/ DF = Electronic warfare triangulates your position by the radio waves you emit by taking/using/passively left on any electronic equipment. They’re so good in modern days that they can usually find you as soon as you start talking over the transmitter. When you’re found they’ll usually hammer you with indirect fire.
Indirect fire = when big shells (like 105mm) go up, things come down. Anything that arcs basically, including if you throw a grenade over a wall.
Direct fire = when someone shoots you with a rifle when the arc is minimal.