Could the USS Liberty have been an intended victim of a false flag simulated Egyptian attack, leading to American involvement on behalf of Israel in the fighting? Though that line of inquiry might appear implausible, the White House ordered the return of US warplanes sent to assist the Liberty, suggesting that Johnson knew who the attackers were in spite of the fact that the Israelis had covered over their aircraft markings in an apparent attempt to blame the Egyptians. One might also recall the Gulf of Tonkin incident.
Manic Moran wrote: »
Stop the Americans from listening in on Israeli internal communications and gaining knowledge of any specific Israeli electronic equipment that they may have.
Manic Moran wrote: »
I've always wondered how it was possible to tell an Israeli Mirage III from an Egyptian MiG-21 at 500' and 300kts...
At approximately 0600 hours (all times local) on the morning of June 8, 1967 an Israeli maritime reconnaissance aircraft observer reported seeing "a US Navy cargo type ship," just outside the coverage of the Israeli coastal radar defense net, bearing the hull markings "GTR-5". This report, made to Israeli naval HQ, was also forwarded immediately to the Israeli navy intelligence directorate.
Throughout the remainder of the day prior to the attack, Israeli reconnaissance aircraft regularly flew out to USS Liberty’s position and orbited the ship before returning to their bases in Israel. A total of no fewer than eight (8) such flights were made.
At approximately 1050 hours, the naval observer from the early morning reconnaissance flight arrived at Israeli air force HQ and sat down with the air-naval liaison officer there. The two officers consulted Janes’ Fighting Ships and learned that the ship reported earlier in the day was USS Liberty, a United States Navy technical research ship.
From 0900 hours on June 8, 1967, until the time of the attack five hours later, USS Liberty maintained a speed of approximately five knots and a generally westerly-northwesterly course.
At 1400 hours, while approximately 17 miles off the Gaza coast, USS Liberty’s crew observed three surface radar contacts closing with their position at high speed. A few moments later, the bridge radar crew observed high speed aircraft passing over the surface returns on the same heading.
Within a few short moments, and without any warning, Israeli fighter aircraft launched a rocket attack on USS Liberty. The aircraft made repeated firing passes, attacking USS Liberty with rockets and their internal cannons. After the first flight of fighter aircraft had exhausted their ordnance, subsequent flights of Israeli fighter aircraft continued to prosecute the attack with rockets, cannon fire, and napalm. 
During the air attack, USS Liberty’s crew had difficulty contacting Sixth Fleet to request assistance due to intense communications jamming
The initial targets on the ship were the command bridge, communications antennas, and the four .50 caliber machine guns, placed on the ship to repel boarders.
After the Israeli fighter aircraft completed their attacks, three Israeli torpedo boats arrived and began a surface attack about 35 minutes after the start of the air attack. The torpedo boats launched a total of five torpedoes, one of which struck the side of USS Liberty, opposite the ship’s research spaces.  Twenty-six Americans in addition to the eight who had been killed in the earlier air attacks, were killed as a result of this explosion.
Following their torpedo attack, the torpedo boats moved up and down the length of the ship (both the port and starboard sides), continuing their attack, raking the ship with cannon and machine gun fire. In Malta, crewmen were later assigned the task of counting all of the holes in the ship that were the size of a man’s hand or larger. They found a total of 861 such holes, in addition to "thousands" of .50 caliber machine gun holes.
Survivors report that the torpedo boat crews swept the decks of USS Liberty with continuous machine gun fire, targeting communications equipment and any crewmembers who ventured above decks.
Damage control firefighters, who had already risked their lives merely by appearing on deck, had to abandon their efforts because their fire hoses had been shredded by machine gun fire.
Survivors also report that the torpedo boat crews fired on the inflated life boats launched by the crew after the captain gave the order "prepare to abandon ship." This order had to be rescinded because the crew was unable to stand on the main deck without being fired upon and the life rafts were destroyed as they were launched.
Stovepipe wrote: »
Survivors were able to testify that the attacking aircraft were Mysteres and Skyhawks, used only by the Israelis.