The Monroe tapes are easy to find online I listened to some of it, was quite relaxing. Wasn't able to leave my body but tbh I didn't really apply myself to it. Had much more luck with RV but I remain skeptical about that too but it was surprising.

The reason the CIA invested in this topic was that they believed that the Russians where interested in it. This is during the Cold War and Nina Kulgina was kicking around doing her thing.

If you believe that your enemy can AP into your sensitive areas that is an issue and you need to be able to counter it. I haven't heard of the force field before but I remember hearing tales of people who tried to access government facilities via AP being intercepted by people. Supposedly these other people are agents of the US gov who would remain in AP for long times to guard these places.

I also remember hearing a story of people trying to access old historical sites like ancient temples and they also ran into beings that stopped them like guardians. Theory on that was it was the spirits of monk's who had taken a vow to protect these sites.

I don't put much stock in any of it but I do find it entertaining and interesting.