Well, morphine addictions did rise as a result of WWII iirc. War isn't very good for soldier's mental welfare.
I can imagine a future general noting "An army marches on it's Fix." Though it's likely not the best army around the place

I imagine the armies of the future might be very.. varied. Nations coming up with very different ideas about the best strategy to win their wars.
- A "regular" army focused on taking and holding ground
- Defense Through Annihilation doctrine; actually preventing damage to your own territory considered unfeasible, but destroying the enemy is the purpose of the war machine. This army might focus on ultra-elite operatives skilled in infiltration, sabotage, terrorism and massive strikes.
- Total Resistance doctrine: everything in the state is mobilized towards resisting invasion. Every civilian with skillwires is conscripted, given military skillsofts and a gun. The idea is that everything worth capturing fights back, until nothing worth capturing remains.
- Subversion and Disruption doctrine: focuses on taking apart the enemy army, and turning it against itself. Would emphasize Matrix and Magic over normal soldiers
- Stay-Behind doctrine: while conquest by a greater power is seen as inevitable, weapons are hidden and plans made, so that if the enemy weakens a resistance force can liberate the country. Expect lots of backdoors in public service computer systems. Hackers are crucial here, as are infiltration-oriented specialists.
- No Bodybags doctine: heavy emphasis on using spirits and drones. Tricky, but popular with voters. Prefers to fight abroad, requiring special measures to prevent infiltration and terrorism in the homeland. Sound familiar?
- Guerilla: use hostile terrain against enemies with superior forces as a force multiplier. Usually a defensive tactic.
- Target Their Boss: focused on intimidating enemy leaders. Assassins primary. Works well against corrupt politicians who prefer to send others into danger rather than themselves.
- Turn Their Soil To Glass: emphasis on bombarding the enemy into submission. Ethical considerations, but tends to be light on casualties of your own.
- Political Warfare: attempt to organize a political collapse in the enemy; by exploiting social problems, replacing enemy leaders with clones, mind control, false information, or UN intervention. Make sure to catalog all their war crimes (even the ones you had to fake).
I'm sure there are more options...