Itthi Military Base, often referred to by tourists as the "Khao Kho Weapons Museum," is one of the most important historical sites in Khao Kho District, Phetchabun Province. Located on a high mountain peak at the border of Phetchabun, Phitsanulok, and Loei provinces, this area was historically a major battleground between the Thai government forces and communist insurgents from 1968 to 1982. At that time, Khao Kho was a strategically crucial location due to its complex mountainous terrain, dense forests, and deep valleys, allowing the communist forces to effectively establish bases and move around. The Thai army spent several years regrouping and launching campaigns to reclaim the area.

The Itthi Military Base historically served as the main artillery base providing fire support to infantry units operating on the front lines. Its high mountain location allowed for controlled firing and a wide view of the surrounding area. This base played a vital role in several important battles in Khao Kho. Particularly towards the end of the war, when the Thai army began to successfully reclaim strategic areas, the name "Base Itthi" was given in honor of Colonel Itthi Simarak, a key officer who played a significant role in the Battle of Khao Kho and died while on duty in the area in 1981. After the conflict ended, the army transformed the area into a historical museum and learning center about the communist insurgency in Thailand, allowing future generations to study this important national event and appreciate the value of peace.

The museum is divided into outdoor and indoor exhibition zones. The outdoor area displays actual equipment used in the Battle of Khao Kho, including F-5 fighter jets, armored personnel carriers, armored vehicles, field artillery, and various heavy weapons. Some pieces still show signs of past use. Tourists can closely examine the details of these weapons, clearly illustrating the military operations of that era. In addition, remnants of tanks and other equipment damaged in the actual battle are preserved as historical evidence and a memorial to the losses during the country's conflict.

The indoor exhibition building houses a collection of old photographs, strategic maps, military documents, shell casings, communication radios, military uniforms, and personal belongings of the personnel who served in the Khao Kho area. The exhibition's content explains the sequence of events in the battles, the operations in the mountainous areas, and the living conditions of soldiers stationed in remote locations, who faced difficult terrain, cold weather, and limited supplies during the war. This information helps tourists understand the historical dimensions of Khao Kho more deeply, beyond just being a typical scenic viewpoint.

In addition to its historical value, the Itthi Fire Support Base is also one of the most beautiful viewpoints in Khao Kho. Situated on a high hill, it offers expansive views of the surrounding mountain ranges and the sea of ​​mist during the winter months. The tranquil atmosphere and cool climate year-round make it a popular destination for tourists who often visit it along with the Khao Kho Memorial, the Khao Kho Royal Palace, and other important viewpoints in the vicinity. Today, this place is not just a weapons museum, but also a site that reflects the historical narrative, the sacrifices of government officials, and the transition from a battlefield of conflict to a comprehensive educational tourist destination in Phetchabun province.

• From Phetchabun city center, take Highway 21 (Phetchabun-Lom Sak) to the Nangua Intersection, then turn left onto Highway 2258. Alternatively, from Campson, follow Highway 2196 according to the signs leading to the Khao Kho Memorial. Itthi Military Base is located about 1 kilometer before reaching the main memorial. The route features steep and winding asphalt roads; drivers should exercise caution and use low gears.

• Visit early in the morning for cooler weather and clearer views.

• Winter mornings often offer beautiful sea mist around Khao Kho.

• Bring a hat or umbrella since most areas are outdoors.

• Comfortable walking shoes are recommended for the sloped terrain.

Admission Fees:

• 10 THB per person (for maintenance and museum upkeep).

Opening Hours:

• Open daily from 07:00 AM – 05:00 PM.