That looks like the Al Mar that I have. thank you.
The SERE's origin is about the friendship between Al Mar and Nick Rowe, a POW for 5 years during the Vietnam War and creator of the SERE program for the US Army.
The very first SERE knife was a 4" folder in AUS-6 with micarta handles.
The idea being to have a solid and reliable knife that a soldier wouldn't be tempted to ditch or leave somewhere due to it being cumbersome.
When it came out, it was the first $100 production knife.
Very quickly that first generation had two other, smaller folders added to the lineup as well as fixed blades the SERE Attack with 5-7" blades, made in Japan, with or without sawback and micarta handles.
A second generation with the sames size blades came but with neoprene handles.
Briefly there was a SERE folder with aluminium handled, who's existence came to my knowledge only a couple of days ago.
The SERE line was discontinued for a while. It came back in folder form in VG-10 and the SERE Operator came back in 2002 with a 5" in 154CM, made in the USA, with and without sawback.
The following year the SERE Operator was moved from 154CM to S30V.
One of these also exist with desert tan handles and sheath.
Around 2008-2010 the SERE Operator was released in VG-10, made in Japan, without sawback with a 5" and a 4" version the mini-SERE operator.
In 2017 Tops released a licensed version of the Al Mar mini-SERE Operator in 154CM with a 4" blade.
Since Al Mar Knives has been bought by ETE in 2019 there has been fixed blade version of the SERE in production.
Hope this helps in your knowledge about your knife.
I would also strongly recommend Nick Rowe's book "5 Years to Freedom" about his ordeal as a POW during the Vietnam War.