. The working principle of the infrared thermal detector is mainly to detect the difference with the large background temperature. Among them, where the temperature is low, there is a blue light map; Areas with higher temperatures show a reddish light map.

The five members of the punishment mercenary team, wearing full-coverage helmets and integrated camouflage combat uniforms, are actually to prevent the heat of body temperature from escaping into the air, which is different from the surrounding ambient temperature, so as to be discovered by infrared thermal detectors.

The fifth main combat team of the Devil Mercenary Regiment tracking behind the punishment mercenary team, they all have anti-infrared thermal detection combat suits, which can also avoid being detected by gunships in the sky.

However, whether it is the guys of the devil mercenary group or the members of the punishment mercenary team, the iron guys riding under them do not have anti-infrared thermal detection devices.

In order to achieve strong off-road performance, mountain bikes must have a powerful engine. Every powerful chemical engine, to put it bluntly, is an engine that uses fuel, and they are bound to emit a lot of heat. In particular, the engine itself and the exhaust pipe.

The engine itself must be cooled down to keep working properly; The exhaust pipe emits the high-temperature exhaust gases released by the combustion inside the engine, which also causes the exhaust pipe heat to be very amazing.

This heat becomes the object of tracking in the sky, by gunships!

Shi Lei's voice came from the Bluetooth headsets of all the members of the punishment mercenary team, "Give up the mountain off-road motorcycle immediately, more than a kilometer away from you, a gunship is flying over, it should have detected the heat emitted by the mountain off-road motorcycle." You only have fifteen seconds at most to escape! ”

All the members of the punishment mercenary team received Shi Lei's message, and without hesitation, he stopped the mountain motorcycle, and then abandoned the car and fled. It's completely unrealistic to race in the mountains and forests on mountain bikes and helicopter gunships. If they don't abandon the car, they don't have the slightest chance of escaping. Instead, abandon the car and run away, there is still a slight chance.

Five seconds later, the members of the Devil's Mercenary Regiment heard the propellers of a gunship in the sky. made the same judgment as Shi Lei, they directly abandoned the mountain off-road motorcycle, and did not continue to chase in the direction of Ye Feng, but retreated behind.

Dick, the fifth main combat squad of the Devil Mercenary Regiment, is quite judgmental. He clearly knew the way, the gunship in the sky. Mountain bikes on the ground have been discovered. Once the front is tracked by them. The sound of the propellers of the gunships was also heard, so the people in front would definitely turn upside down and find trouble with them. So instead of going to the front, they choose to run backwards.

It's a pity that no matter how judgmental Dick is, he can't imagine that they are tracking Ye Feng. It is not a native of South Vietnam, but an enemy of the South Vietnamese country.

Dick led the five members of the Fifth Main Combat Team of the Devil Mercenary Regiment to retreat to the rear, trying to evade the search of the helicopter gunship in the sky.

Ye Feng led the four members of the punishment mercenary team. Running quickly through the mountains, they no longer care if there would be footprints on the ground, and the enemy would follow them.

Now is not the time to worry about these issues, and their number one goal at the moment is to get far enough away from the mountain bikes to avoid them getting caught in the pond.

"Boom Boom Boom~"

Behind the punitive mercenary team, three loud explosions were heard, which were helicopter gunships in the sky, directly attacking the mountain bikes of the devil mercenary group, and it happened that the aviation machine gun exploded three of them.

"Concealment, keep the action prohibited!" Ye Feng is in the Bluetooth headset network, notifying other members to minimize activities and reduce heat generation, so as to prevent heat escape.

However, a strange thing happened, the armed helicopter hovering in the sky did not directly attack the mountain off-road motorcycle ridden by Ye Feng and others, but took the initiative to contact the command center, this is because the mountain cross-country motorcycle ridden by Ye Feng and five people came from a secret military warehouse on the border, which belonged to the equipment of the real South Vietnamese military, and a friend or foe identification code transmitter was installed inside.

"Call the command center, call the command center, found five mountain off-road motorcycles, according to the identification code system of friend or foe, these five mountain off-road motorcycles came from the S035 border secret military warehouse. About a kilometre behind the five MTBs, there are several other MTBs, but they are not owned by us. Now, request the latest command from the command center. "The pilot of the ACH-47 gunship, inquiring about the processing orders from the control center.

"HA004, please wait, the command center is checking the usage records of five motorcycles." The military network of the command center quickly found out the ownership of the five military mountain bikes, as well as the signed list of the latest dispatch.

According to the recorded situation, the command center immediately contacted Captain Tao of the secret military warehouse on the S035 border, "Tao Dekai, with the rank of major, the patrol leader of the secret military warehouse on the S035 border." Hello, this is the command center of the Northern Operational Command. May I ask Major Tao, before you were attacked today, you personally approved the transfer of five military mountain off-road motorcycles containing our country's friend or foe identification code chips, so where are these five military mountain off-road motorcycles now and who are using them? ”

Tao Dekai said with a little smugness in his tone: "Those five military mountain off-road motorcycles were handed over to Comrade Captain Ye of your Northern Operations Command!" With his teammates, he has already left the secret military warehouse on the S035 border. ”

"Major Tao, may I ask which Captain Ye is it?" The personnel of the command center always maintained a calm tone, as if there would never be any emotion.

"It's the Captain Ye who delivered rice to our S035 today, and he came over with five truckloads of rice just after six o'clock this morning." Tao Dekai explained in detail.

The tone of the personnel in the command center of the Northern Combat Command finally changed, "Major Tao, our Northern Combat Command did not send any personnel to the secret military warehouse on the S035 border today. Are you sure you asked that Captain Ye codeword? ”

It is true that the garrisons and cargo personnel of the secret military warehouses on the border cannot have any identification documents, but in order to ensure the smooth handover of the two sides, every time they receive a task, they will always get a code word, as long as they match the code word, they are their own people.

The cold sweat on Tao Dekai's face was frightened out in an instant, he didn't talk to Ye Feng at all, and he didn't get the corresponding code prompt in the query system of the Northern Operations Command at all.

That is to say, Ye Feng is not a member of the Northern Combat Command at all, and the detailed information he inquired about is not fed back by the Northern Combat Command at all. After all, not long after Ye Feng arrived at the base, the S035 base was attacked, which was a bit too strange.

"Major Tao, that Captain Ye is a person who is pretending to be the Northern Combat Command, right?" Northern Operational Command, personnel from the command center asked.

Tao Dekai replied helplessly: "That's right! He's a fake! I have been derelict in my duty and I am willing to accept the punishment! Tao Dekai knew that he was finished, and the secret military warehouse on the S035 border was attacked, and he couldn't get away with it at all.

The command center got an accurate answer and immediately fed back to the ACH-47 gunship with the number HA004.

"HA004 Please note, this is the command center, tracking down the personnel who use five of our mountain bikes, those five personnel are posing as personnel of the Northern Combat Command, they have been defined as enemies, and the command center authorizes free fire!" Personnel in the command center commanded helicopter gunships.

The helicopter gunship, numbered HA004, immediately responded: "HA004 understands, the order has been received!" ”

……

Xia Guo, Shuangqing City, Jingya Garden.

Shi Lei has just cracked the monitoring authority of the Northern Combat Command, and he is in the internal network of the Northern Combat Command, listening to various intelligence information from the command center.

All the intelligence information will be judged by Yishuer once, and Yishuer will screen and judge the information that meets the keywords set by Shi Lei. For example, the information of the fake person just now, Yi Shuer specially screened it out for Shi Lei.

Shi Lei checked the information screened out by Yi Zuer, and his face was a little pale because he stayed up late, but he was even more pale. He contacted the five members of the Punishment Mercenary Clan through the Bluetooth headset, "Punish the Mercenary Clan, please note that you have been marked by the South Vietnamese State as impersonating personnel and have become the absolute enemy of the South Vietnamese Nation. ”

"Boss, what direction should we take now to be out of danger?" Ye Feng asked Shi Lei, hoping to get Shi Lei's remote support.

It's a pity that Shi Lei can't provide remote support for the time being!

"Ah Feng, you can't provide map information for the time being, you use the compass to guide the way, your final destination is Meishan Island, once you arrive at Meishan Island, you will be safe!" Shi Lei said with a sense of regret.

Ye Feng didn't express his dissatisfaction, or any other attitude, he just responded: "Understood, boss." ”

In the sky above the dense forest, a helicopter gunship numbered HA004 called for support from other helicopter gunships. If the five members of the mercenary team are punished and cannot leave the dangerous area of the secret military warehouse on the border for the time being, I am afraid they will be really dangerous!

The punishment mercenary team is the sharpest knife in Shi Lei's hand, Shi Lei doesn't want to lose the punishment mercenary team at all, but the damn devil mercenary team suddenly killed, and Shi Lei is helpless to face the battle.

Two minutes later, three armed helicopters had gathered in the sky above the dense forest where the punishment mercenary team was located, Ye Feng looked at the dense forest fault not far away, he contacted Shi Lei and said, "Boss, we are currently in a desperate situation. A fault has appeared in the dense forest ahead, and it is no longer possible to isolate us from the threatening gaze from the sky. There were also followers in the rear, and the paratroopers of the South Vietnamese State had joined the battle, and they could arrive in fifteen minutes at the latest. Boss, what should we do now? ”.

(To be continued......)