Q: "Rapid progress, to where humans learned to control their military with drugs..."
Three main options there, I think.
Q might be talking about drugs that have a controlling chemical effect - i.e. they make the soldiers go suitably berserk in attack and suitably docile when ordered around by their superiors. Or he might be talking about drugs that make the soldiers feel good, and control that is exerted through regulating the soldiers' access to that drug. Or he might simply be talking about what every military does today already - giving the soldiers drugs that keep them going where non-drugged individuals would fall fast asleep or stop to nurse their wounds.
We see Q-as-soldier take a sniff from his drug dispenser and apparently enjoy the experience. This might suggest Option B, but how is it control when the soldier is given his own supply of the drug to carry? How is the drugged soldier made aware of the fact that only obedience guarantees resupply, when the onboard supply already makes him insensitive to such Earthly troubles?
OTOH, leaving the soldier to himself do the sniffing makes Option A a bit unlikely. How does one guarantee that the soldier doesn't take the berserking dose when asked to become docile?
Option C would sound the likeliest, really. But is it really "control"? Keeping soldiers on uppers has already backfired a couple of times, most notably in recent high-profile media wars where blue-on-blue incidents get unwelcome publicity.
The padded suit is a very welcome scifi element, BTW. Protecting a soldier with soft pillows looks really futuristic for the 1980s (or even today, despite the proliferation of frontline flak jackets) and at the same time oddly realistic... Perhaps the Klingons have the right idea after all?
Timo Saloniemi