Don't even get me started on Saudi Arabia
The Saudis have always been deeply frightened of the military and they swore to never allow a real functioning army to be created, because they might lose control over it. Its always been a facade, the security of the House of Saud was guaranteed by the US. They then proceeded to reward their masters by allowing US and British Defense firms to get their own slush funds and sources of easy cash in the form of regular arms purchases.
The whole point of the Saudi armed forces is to provide a form of social security for Saudi youth and a place to dump potential troublemakers. It is also as a form of tribute to the US and UK by propping up their defense firms by buying equipment that Saudis cannot even man fully.
The only functioning armed group in Saudi is the National Guard and they are composed of loyal tribesmen to the throne. They are better trained/equipped than the army and their job is to protect the House of Saud NOT the country. So they specialize in counterterrorism/insurgency and intelligence gathering.
The whole thing is fake news, the Saudis still have Pakistani Air Force pilots on loan to man their fighter planes. They're using mercenaries from Latin America in Yemen right now. Training for the army is non-existent.
It explains how Houthi tribesmen who are driving technicals and armed with lighter arms that are not as advanced have overpowered and brutalized a couple of Saudi brigades.
On paper, Saudi Arabia is a major power on the level of Israel and Turkey with the types and number of weapons systems available. The reality is that Saudi's 250,000 armed force is more or less equal to Oman's tiny yet effective 30,000 man armed force. The UAE's 50,000 man force is superior to the Saudis and can hypothetically defeat the Saudis in a war. You really think they can go toe to toe with Iran?
If Jordan is given permission by the US, they can avenge history and reclaim the Hejaz and all Saudi Arabia within weeks, there will be minimal opposition from the army. They will face a challenging guerilla war from the loyal tribes in the National Guard.
They have used so much of their foreign currency reserves for the war in Yemen. Saudis are going to actually be taxed now and subsidies are being cut. They're performing self sabotage.