Hell Let Loose Vietnam: NVA Tunnels vs US Helicopters

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Core problem: matches swing on whether each side actually uses its own system and kills the other side's logistics. US tempo vs NVA attrition is the recurring community take. Helicopters decide where the fight happens if the US keeps moving. Tunnels decide who is still there if the NVA rebuilds after every flip.

How the Two Systems Differ

NVA

Tunnels

Built by Squad Leader, Commander, or Recon Spotter. No supplies needed. Place in friendly, neutral, or unlocked enemy territory. Connect on the tactical map to another tunnel or a garrison. You do not crawl through them, you interact, pick a destination, and take a time-skip based on distance (max about 400 m after balance changes). Auto-destroyed when the enemy captures the sector they sit in. Cooldown now 10 min in 1.3, and travel to a "hot" destination is blocked.

Helicopters

Transport birds move squads and act as a mobile spawn when landed. Motor running matters, community reports they are not a spawn if the motor is off. Officers can drop a Field Pad spawn after exiting. Support and logistics birds drop supplies so you can plant garrisons fast. They are loud, visible, and eat RPGs, AA, and small arms if you hover or fly the same lane twice.

1NVAConcrete Tunnel Steps

1
As SL or Commander, open the Field Pad or notebook, select Tunnel, hold to place.
No crate needed. Stay off locked enemy sectors.
2
Immediately open the tactical map. Click the new tunnel, then click another tunnel or a garrison within about 400 m to connect.
Unconnected tunnels do nothing useful.
3
Place the next one as a relay, not as a "forward spawn."
Community consensus: garrisons first for actual spawns, tunnels as the links between them. A lonely tunnel in the open gets farmed.
4
After a sector flips, assume that network is dead. Rebuild behind the new line on cooldown.
Do not mourn the old web.
5
Use the network to appear on the flank of an LZ or road, not to teleport onto the cap itself in the open.
Ambush the insert, then vanish.

Decision point: Build deep and hidden vs build close to the cap. Close means faster defense but dies the second the cap flips. Deep in cover means slower first response, survives longer and supports flanks.

2USConcrete Helicopter Steps

1
Treat transport birds as the insert tool, not sightseeing.
Land, dump the squad, Officer plants Field Pad spawn, bird leaves. Hovering is how you donate the Huey to an RPG.
2
Use support and logistics birds to drop supplies on a sensible garrison spot, build, leave, refill.
One coordinated pilot can seed a garrison net faster than infantry walking crates.
3
Change LZs.
Same rice paddy twice means NVA already has RPGs and a tunnel exit aimed at it.
4
Water drops: squads can bail over deep water with little fall damage so the bird never has to sit still.
5
Two birds plus two squads equals an improvised airhead behind the NVA line if you actually land together and plant a garrison immediately.

Decision point: Hot-drop on the next cap vs land one grid back and walk in. Hot-drop wins tempo if the LZ is unexpected. One grid back wins if AA or RPGs are already covering the obvious pads.

3How to Fight the Other System

US vs Tunnels

Hunt and push sectors

Listen for Morse, radio, or lantern cues. Destroy the entrance you find. Push the sector so remaining tunnels auto-delete. Do not "clear" ground and walk away, NVA will rebuild on cooldown if you leave the sector green for them.

NVA vs Helicopters

Cover the LZs

Watch the sky and the usual LZ shapes: clearings, river banks, roads. RPG and AA the hover, not the speck at altitude. Put a tunnel exit covering the pad so the squad that just landed walks into a prepared kill. Do not waste the first RPG on a bird that is already leaving.

Common Mistakes

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Treating a tunnel as a garrison. It is a link, not a spawn by itself. Build the garrison, then the tunnel off it.
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US teams sitting still after the first insert. Firepower only works if you keep projecting from new LZs.
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Rebuilding the exact same tunnel cluster after it dies. Cooldown plus sector rules punish copy-paste.
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Helicopter pilots landing the same obvious pad or shutting the motor off and wondering why no one can spawn.
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NVA stacking every body on one cap instead of using the network to hit the next insert.

Play the doctrine you spawned into: US keeps the map small with birds. NVA keeps the map full of exits the US did not see.

How the Two Systems Differ

1NVAConcrete Tunnel Steps

2USConcrete Helicopter Steps

3How to Fight the Other System

Common Mistakes

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