You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Israel

Context:
The nation's military relies heavily on high-tech weapons systems designed and manufactured in Israel as well as some foreign imports. The Arrow missile is one of the world's few operational anti-ballistic missile systems. The Python air-to-air missile series is often considered one of the most crucial weapons in its military history. Israel's Spike missile is one of the most widely exported ATGMs in the world. Israel's Iron Dome anti-missile air defense system gained worldwide acclaim after intercepting hundreds of Qassam, 122 mm Grad and Fajr-5 artillery rockets fire by Palestinian militants from the Gaza Strip. Since the Yom Kippur War, Israel has developed a network of reconnaissance satellites. The success of the Ofeq program has made Israel one of seven countries capable of launching such satellites.

Question:
What is one of the most crucial weapons in Israel's military history?

Python air-to-air missile series