They are an ETO Liaison Squadron, meaning they were in Europe in WWII. Below is their basic information from a website. Based on where they were located, I would guess they were attached to either 1st US Army, 9th US Army, or 12th Army Group.
158th Liaison Squadron: Constituted on 2/23/44 as 158th Liaison Squadron and activated on 3/1/44.
Constituted on 9/1/43 as 423rd Night

1944 Continental Nov 12/13/44 Natwich, England 2/4/45 Somme-Suippe, France 2/15/45 Celles, Belgium 4/17/45 Ahrweiler, Germany
I concur with Taylor about Jim Gray. He has a great store of knowledge about Liaison Squadrons in WWII. But here is the general info on a Liaison Squadron in WWII in ETO from my research. They were assigned to a theater air force (I believe the 158th was 9th Air Force) but were attached to Army Ground Forces, usually at the Field Army or Army Group level. Use varied from Army to Army, but generally speaking, the squadron attached field detachments to the subordinate Army Corps which were part of the Field Army. A few airplanes, pilots, mechanics and a driver or two would be attached to the Corps Headquarters and do whatever was needed. Missions varied- mail, courier work, personnel transport, artillery spotting, and combat control of air support were some of them, but most missions were the first three. Pilots were mostly Sergeant Pilots, but there were Commissioned pilots in the squadrons. 140 people were assigned to each squadron. The squadrons trained in the US for about a year, then were shipped overseas for use for the rest of the war.
One reason you will have a hard time finding information is that while they were AAF units, they were really assigned to Army Ground Forces (AGF). So the AAF, which didn't want them in the first place, wasn't particularly interested in preserving their history. And the AGF moved them around so much, and they weren't officially part of their units, so they didn't write much about what they did. They are really an orphan unit from WWII, only existing during WWII and right after.
I have done a lot of research on one particular Liaison Squadron- the 14th, which was an ETO unit, so I can provide some information if you have specific questions. I know more about their equipment and operations in general but ask and I'll see what I can come up with.
Last edited by
Forgotten Field on Wed Jul 22, 2015 7:54 pm, edited 1 time in total.