I am sure that the military owns both commercial and combat vehicles. For example the military may own busses used to transport troops. Even though the military uses busses I doubt that a bus would be classified as a combat vehicle. A combat vehicle used to transport troops would be an ammored personnel carrier.
So this is what causes the confusion because a mechanic in the military who works on busses would think that you can use only us a straight 40 weight oil in a 2 stroke diesel engine and if you use a multigrade you will blow up the engine. Yet a military mechanic who works on combat vehicles knows that it is perfectly acceptable to use a multigrade in a 2 stroke diesel engine. The reason for this is because combat vehicles require lubricants that operate under a wider temperature range. So a combat grade lubricant will be of higher quality than a mere commercial grade lubricant.
So this is what causes the confusion because a mechanic in the military who works on busses would think that you can use only us a straight 40 weight oil in a 2 stroke diesel engine and if you use a multigrade you will blow up the engine. Yet a military mechanic who works on combat vehicles knows that it is perfectly acceptable to use a multigrade in a 2 stroke diesel engine. The reason for this is because combat vehicles require lubricants that operate under a wider temperature range. So a combat grade lubricant will be of higher quality than a mere commercial grade lubricant.