Until after WW II (well into the Cold War) the US Gov't did not export any US Military ammo ( ie, those with the US Gov't headstamps, whether made by GOGO or GOCO or COCO Plants for the US DoD.).
When countries ordered "military "style ammo from the big Commercial makers ( USCCo, Winchester/Western, Remington, etc ( different companies existed at various times from 1900 to 1950s), the ammo was usually packed in "anonymous " or "Plain" packets with simple ammunition descritions, mostly in English (But pre-WW I Spanish was also used for the Latin America trade.
The crates were usually standard Win/Rem crates, of the commercial style ( painted/embossed wood, etc.).
That's what I meant by "Military Export" context...being ammo produced by the US Commercial makers, on order for the armed Forces of various nations, using a FMJ ("Full metal Jacket") or MC ("metal cased") projectile. Ie, a definitely Military use cartridge.
The use of this type of "Export" continued into the 1960s, with Winchester making this "Generic Military" ammo for Indonesia ( .303, 7,9mm, 9mm, .45ACP, and probably .30/06 also) all using a "commercial style" headstamp (ie, NO year date) and also Early Israel (.303, 9mm, maybe 7.9mm at least) and various other countries. The Packets were all "whitebox types" similar or more spartan than the pre-WW II boxes.
I have a couple of Winchester Red embossed heavy Pine crates (1,000 of either .303 or 7,92) and one of 2000 .45ACP origin, all directed to Jakarta, in the 1950s. Except for the top printed Address on the case ( directly into the wood) the internal; cartons didn't show any indication who was the customer. Basically "off the shelf" ammo for Military use.
After the 1960s, the US began supplying directly from DoD stores, US Military headstamped ammo for its Mil-aid programs ( along with Rifles, MGs etc.).
Winchester still kept supplying "military export" ammo, to various countries which did not rely on US Aid programs ( ie, the Irish .303 contract of the late 1980s, etc), but with a dated headstamp ( as requested by the Customer.)
US commercial contract ammo for Military buyers has dropped off, mostly due to Cost ( Euro and Asian suppliers can sell it more cheaply) and because of the large quantities of Milsurp still out there.
One could say that the US Gov't effectively cut the legs out from under the US Commercial Military Export ammo business by using its "market Power" (large stocks of virtually free ammo) to undercut any commercial maker.
The "White Packet" is a source of interesting Historical military and Political shenanigans, if researched deeply enough....