This list shows the minimum amount of Orcas or Apaches needed to destroy their targets. Note that when I mention "Attack Helicopter", I am referring to both, Orca VTOL Assault Craft and the Apache Attack Helicopter. Though, the remastered Tiberian Dawn only dubs the Apache as Attack Helicopter, I will call it Apache in this guide. This guide assumes the target unit is stationary, except the Gunboats.

I will also list the amount required if the target is being repaired. For vehicles, it is based on when the unit is parking on a Repair Bay. For structures, it is based on the structure getting repaired as soon as the attack helicopter's first shot lands on it. The amount needed to destroy target being repaired are in brackets.

For the Infantry section, I have listed how many infantry of the same type a single fully-loaded Apache can kill in a single attack run by attacking one-by-one, meaning splash damage isn't considered.

So, buckle up and grab your aviators, because we're in for a hella-copter ride.

• Targets being repaired usually take at most one extra attack helicopter to be destroyed.
  
  
• Infantry take less damage in prone stance. Usually, they will automatically go prone when under attack but if they are stuck, they will stand still even when under fire. Technicians also have this damage resistance when they are not stuck despite they do not have a prone animation. This is relevant to Orcas as it takes less Orcas to kill infantry that are standing still.
  
  
• As stated above, all these values are based on stationary targets. Moving units take less damage and may require 1 more helicopter to be destroyed. For example, 3 Apaches can barely destroy a Harvester so a moving Harvester might survive 3 Apaches. It is best to wait for the Harvester to start harvesting on a tiberium field before attacking.
  
  
• Gunboats are always on the move. I put a + sign in front of the number needed to destroy them because the number is the minimum amount and you will most likely need more than that as they will constantly evade incoming attacks. It is easier to hit them when they are low health (they become slower) or near the edge of the map doing its 180 degrees turn.
  
  
• SAM Sites take about twice more damage when the battery is exposed. The guide above shows the amount needed to destroy enemy SAM Sites (where the battery will automatically surface to shoot) but for some reason if you need to destroy an ally SAM Site (which remains underground since it won't target friendly air), destroying it takes 5 Orcas (being repaired or not) or 9 Apaches (if not being repaired, retracted SAM Sites being repaired take more than 10 Apache which isn't worth trying).
  
  
• Airstrip being repaired takes more than 12 Apaches shooting at it in order to be destroyed. I didn't put a specific number because the Apaches will usually bug out (no pun intended) when there's too many attacking at the same time, returning back to their helipads. Even if you constantly click the target to keep ordering them to attack, the delay will give enemy more repair time which can give inconsistent results. Same goes for the temple.
  
  
• If a vehicle that requires more than 3 Apaches to be destroyed is being repaired on a Repair Bay, the Repair Bay will be destroyed first if you attack the unit with more than 3 Apaches.
  
  
• Apaches can save ammo if they attack infantry that are grouped together. For example, 1 Apache can kill 2 Commandos max that are spread out but if the commandos are standing on the same cell, it is possible to kill 4 with the same Apache in a single attack run.
  
  
• A single Apache can fire up to 15 machine gun bursts. Hence, it is able to kill 15 Phil Technicians in a single run.
  
  
• When attacking a group of infantry with the Apache, aim for the centre unit first to maximize damage.
  
  
• For civilian buildings, the small ones usually take 2 Apaches or 3 Orcas to destroy them. The 2x2 ones usually take 5 Orcas or 4 Apaches. The Oil Tanker is probably the least armored civilian building.

Finally, don't take this guide too seriously because there are factors that can give different results:

• If your first helicopter arrives and attacks early before the others, the opponent will have more repair time.
  
• Orca missiles sometimes miss their target. This is probably RNG but it is more common when attacking infantry. Hence, I put 2 numbers on some of the results.
  
• Your attack helicopters always move sideways in between their shots. If you have many helicopters attacking the same target, they may move sideways a bit longer before shooting again due to having less room which can give the enemy more repair time.
  
• I made this guide simple and basic, there are other more advanced tips that I didn't cover here.

I might update this guide in the future for easier reading or if there's an error in my calculations. Please let me know in the comments if you find any errors.

This guide is a personal reference to help me remember how many gunships needed to destroy stuffs during a match. I hope you find it helpful as well. If you like the guide, do leave a like or favorite it in case you need to read it during your battles, and if you don't, I thank you for reading this far. I wish you and your pilots good luck on the battlefield.