This was too good an opportunity to miss and also too good a description from ARRSEpedia
When a soldier in the field is seen wandering off into the bushes with a shovel, he is recce-ing a quiet spot in which to park a Compo Anaconda. Not usually seen until at least day 3 of an exercise due to compo's binding properties.
However if said soldier disappears with a shovel at exactly the same time every day, claims to be Dutch or South African and the UK is once again at war with the Germans... it's best to assume he's a Jerry spy no matter how nice a bloke he is. On arrival at your destination, buy him an ice cold pint then shop him to the RMPs.
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This t-shirt makes for a great staple! It has a classic fit (not form-fitting) with a thick cotton fabric.
• 100% cotton (Heather colors contain polyester)
• Fabric weight: 6 oz (203 g/m2)
• Shoulder-to-shoulder taping
Model is wearing a size M. He's 6.2 feet (190 cm) tall, chest circumference 37.7" (96 cm), waist circumference 33.4" (85 cm).