Roosevelt was a clever man, and he immediately sent a letter to Stalin posing as a leader, inviting Stalin to send a diplomat and a general to Washington to discuss the battle plan.

At the same time, Roosevelt also pointed out in the letter:

"We already have a preliminary plan, which is aimed at attracting 40 divisions of the German army. Therefore, we intend to commit 48 divisions, including 9 armored divisions, and the air force to support the attack will need 5,800 fighters and a large number of warships and transports. ”

Finally, Roosevelt also stated: "Unlike other people's opinions, my view is that Hitler must be defeated first. Therefore, we are ready to do everything to lighten the burden of the USSR against Hitler as quickly as possible! ”

This letter was undoubtedly a relief for Stalin, and Roosevelt was immediately contacted by diplomats.

The international status and influence of the United States have steadily increased because of its attitude of actively participating in the war, while Britain has been declining because it only cares about its immediate and national interests, and even if it had not planned to rely on Britain as a base, the United States and the Soviet Union might have left Britain aside, but Churchill did not realize this.

Of course, Qin Chuan's side didn't know anything about the open and secret battles between the three giants of Britain, the United States, and the Soviet Union, and what he was doing now was to work with Conrad to improve some of the problems of the helicopter.

"In the process of flying rope down, we found that the weapons and equipment were basically useless!" "So that's definitely something that needs to be improved!" Conrad said. ”

Conrad was right, half of the Juncker's machine guns were mounted on the back, two on the wings, but the sighting system was all aimed at enemy aircraft...... That is, it is used for self-defense when intercepted by enemy aircraft.

At this time, on a helicopter, these self-defenses against the air are completely unnecessary, because it can basically be said to be a kind of equipment aimed at the ground.

"That's right!" Qin Chuan said: "It is necessary to change the sighting system to the ground, in addition, to increase the thickness of its armor, and to change the machine gun to a larger caliber ......."

"Major!" Conrad interrupted Qin Chuan's words and said, "It's not that I haven't thought about this, but have you thought about it...... The helicopter has limited lift, and if we do such a modification, it will only be able to carry weapons and armor and not be able to transport it! ”

"Of course I did, Colonel!" Qin Chuan replied: "But...... Why don't we separate them? ”

"What?" Conrad didn't understand what Qin Chuan meant by this.

"It's like our Air Force has planes specifically for combat, for bombing, for transport!" Qin Chuan said: "Why can't helicopters have planes specifically used for combat? ”

Conrad couldn't help but let out an "oh" when he heard this, and then patted his head in agreement, "That's right, Major." I'm so stupid that all the problems will be solved, and we can design helicopters that are specifically used for combat, transportation, and even rappelling, which will greatly improve their respective efficiency, such as combat helicopters that can safely pile weapons on them, such as cannons! ”

"If you want, you can also equip it with rocket launchers!" Qin Chuan added.

"Bazooka?!" Conrad looked at Qin Chuan in a daze.

"Of course!" Qin Chuan replied: "It's like the 'Stalin Organ', its advantage is that it has no recoil, isn't it?" This advantage is useful for helicopters! ”

(Note: the German name for the "Katyusha" rocket launcher is "Stalin's organ")

"That's right, Major!" Qin Chuan's statement made Conrad excited: "God, rocket artillery...... We set up the shells underneath and fire them at the target after lifting! This is really a genius idea, major, we can even use it to fight enemy artillery, tank groups, or convoys, etc., and more importantly, it can fly away after fighting, much faster than the Soviets used cars as chassis! ”

This can also be seen from Conrad's quality in military equipment: the "Katyusha" rocket launcher itself can be said to be very fragile and even has no defense, but the reason why it can exert such great power on the battlefield is that it runs fast, shooting 16 rockets in a salvo in 7 to 10 seconds, and then immediately transfers ...... At this time, no equipment had such a quick reflex and could counterattack it in 7 to 10 seconds, so there was always nothing to do with it, unless it was detected by a reconnaissance plane in the air and prepared early.

If you start from this idea...... Helicopters are also vulnerable, but they are almost invincible if they are equipped with rocket launchers with a range of 8 kilometers or more, because they can fly low and then suddenly raise their heads to fire a volley of rockets at the target, and then quickly reduce the altitude and shift.

Compared with the "Katyusha" rocket launcher, it has the advantages of fast speed, strong maneuverability, longer range, and no terrain restrictions.

The more he thought about it, the more excited Conrad became.

"God!" Conrad said: "Why we have not recognized the benefits of this equipment, we should use it only as an artillery observation aircraft, what a stupidity!" Very foolish! ”

"Do we have rocket artillery?" Qin Chuan asked.

"Yes, of course!" Conrad replied.

In fact, Qin Chuan knew that the Germans were even earlier than the Soviets in their research on rocket artillery, and developed rocket-powered weapons as early as 1929, which was 6 to 10 years earlier than other countries.

But it is a pity that the Germans have high requirements for accuracy, and the accuracy of rocket artillery is very poor, so this equipment has not been paid attention to by the military, and only a small number of German troops are equipped with rocket artillery, most of which are used to launch smoke grenades...... Firing a smoke grenade does not require a precise strike, it only needs to be thrown near the target.

This was completely different from the direction of development in the USSR, where the Soviets did not take into account its accuracy, but sought to achieve the goal of simultaneously covering the target in a short time with a large number of shells.

It turned out that this tactical thinking of the Soviets with rocket artillery was correct...... The Germans gradually realized this only after being repeatedly hit by the "Katyusha" rocket artillery on the battlefield.

So, the Germans also had their own rocket artillery.

It was produced very simply, it was just a matter of moving it to use as a smoke launcher, and then quickly moving it to a half-track to become a self-propelled rocket launcher...... THIS IS THE TYPE 42 150MM SELF-PROPELLED ROCKET LAUNCHER.

What Qin Chuan has to do now is to move these rocket launchers to helicopters and put them on the battlefield.

Of course, because the accuracy of rocket artillery is not high, this requires the production of a sufficient number of helicopters to cover the target with fire.