The pictogram on the road-sign is just the symbol within the swiss armed forces for a Truck driver. That’s the reason why you probably won’t find it unless you know what you are looking for.
The drivers themselves will get a badge like the one below.
So this sign is an instruction for a military truck driver.
Signals with a black border and black text on yellow ground are military signals, as defined in Art 101.8 of the Swiss Road Signal Ordenance (Signalisationsverordnung, not available in english):
Gelb-schwarze Signale, ausgenommen die Signale «Hauptstrasse» (3.03) und «Ende Hauptstrasse» (3.04), richten sich ausschliesslich an die Führer von Militärfahrzeugen.7 Die Signale haben einen gelben Grund; der Rand, die Schrift und die Symbole sind schwarz. Die Bestimmungen zum Schutze der Signale (Art. 98 SVG) sind anwendbar.
They are only valid for drivers of military vehicles while in active duty.
The meaning of these symbols is the following
(Image courtesy of Swiss Army Logistics Base, not available online)
On how to read the sign post in the first picture in general, the general rule is to read from top to bottom:
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