I was in grade 11 and still deciding on that whole college thing while serving in the army reserve. My friends and I were playing things like Halo 2 and SOCOM: US Navy SEALS 3 a lot. I was really big into Blink 182, Sum 41, and the Offspring, which were massive bands at the height of their popularity. Most everyone skateboarded, and longboards weren't a thing. You got them to do tricks rather than exclusively piss off motarists. Nobody heard about global warming, our biggest fear was the hole in the ozone layer getting as big it would bombard us all with unshielded solar radiation. The whole "holy shit we're killing our planet" thing didn't grab social consciousness until a couple years later when An Inconvenient Truth became a super huge hit. Pop music was still as largely awful in 2005 as it is today, only the stars back then are people nobody remembers now, kind of like how nobody in 2005 knows anybody from 1995.
The world was still largely shitting itself over terrorism because 9/11 only happened 4 years before and everyone agrees life changed immensely after that and a lot of the really invasive legislation and bills took places, spy agencies gained terrifying new powers, and nobody really knew or understood what was going on or the long term consequences, and just about every country in the Western world went on a huge pro-military stint with increased popularity for the armed forces and renewed interest in modernizing their military forces/ promoting good relations with the general public.
Here in Canada,we basically fell in love with our military and the people serving in after a decade or so of total neglect and apathy, and while a huge percentage of the Canadian population didn't agree with the war in Afghanistan, the near unanimous mentality was to support the troops, which I think was really inspiring. It also showed people could give a shit about those in uniform without necessarily agreeing with what the government makes them do.
This was also around the time where digital camouflage became a thing, with Canada becoming pretty much the first country in the world to adopt a digicam uniform, whose design the US marines would later make a lisenced copy of, and this increased spending also revamped militaries away from a cold war mentality of conventional warfare into fighting low level insurgencies against asymmetrical forces.
This was also around the time gun customization became a thing and guns started being covered with more rails and pointless accessories than a Kardashian. I think the US military, for instance, had only just started using optical sights on their rifles, and M-16s were just starting to lose favour to the M4s. There weren't really drones at this point, save the new Predator drones which were being promoted as an alternative to fighter jets for air strikes because there's no pilot to risk. One went down in Iran somehow and everyone freaked out about Iran having access to super high tech and rare military hardware. Now, there's so many drones I think they come out of vending machines.