Here's what I came up with on Google:
A wide range of U. S. Military (MIL) Specifications exist for the use of the U. S. Department of
Defense and other Government agencies. The approval and maintenance of a MIL – lubricant
qualification not only requires manufacture and testing of a fixed additive and base oil
formulation, but a “Manufacturing Facility Survey” is also required. All U.S. Military
specifications are now issued as Performance Specifications designated as MIL-PRF.
MIL-PRF-2104G
SAE 10W, 30, 40 & 15W-40
APICG-4, CF, CF-2 & Allison C-4
Most commercial HDMO's meeting these requirements would also meet API SJ.a
MIL-L-2104E (Superseded March 1992)
Approximate equivalent of API Service Classification CD-II in diesel engine performance, while
testing in spark-ignition engine tests suggests a petrol engine performance in the area of API SF.
MIL-L-2104D (Superseded August 1988)
Appropriate equivalent of API Service Classification CD with gasoline engine performance which
fell between API SD and SE. Passing performance in DDA 6V-53T, Caterpillar TO-2 and Allison C-
3 tests also required.
MIL-L-2104C (Superseded April 1983)
Approximate equivalent of API Service Classification CD/SD. MIL-L-2104B (Superseded
November 1970) Required performance in the 1-H, L-38 and LTD engine tests Prior to MILL2104A,
several Military Ordnance and U.S.
Army Specifications were in place. Details are as follows:
MIL-O-2014 (ORD) - issued August 1950, Superseded by MIL-L-2104A, February 1954. U.S. Army
2-104B - issued May 1943, Superseded by MIL-O-2104 (ORD), August 1954. Supplement 1
applied to U.S. Army 2-104B but was never written into the specification itself. This “Qualified
Products List” (QPL) listed oils which were tested against higher sulfur fuel.
Supplement 2 applied to U.S. Army 2-104B but was never written into the specification itself.
This OPL listed oils which were also approved under Caterpillar Superior Lubricants (Series 2).
U.S. Army 2-104A and 2-104 were issued between 1941 and 1943, and were superseded by U.S.
Army 2-104B, May 1943.
Note: U.S. Army 2-104B, Supplement 1 was a higher performance level than the subsequent
MIL-O-2104 (ORD) and MIL-L-2104A Specifications and “Supplement 1” became an accepted
industry guideline until the issue of MIL-L-2104B in December 1964.
Looks pretty broad to me...