This requirement will be in support of an MAC KTC for SUBMARINE ESCAPE IM (Submarine Escape Suits) - NSN 3H 4220 015695520. There are only two apporved vendors that the Government will be dealing dire... This requirement will be in support of an MAC KTC for SUBMARINE ESCAPE IM (Submarine Escape Suits) - NSN 3H 4220 015695520. There are only two apporved vendors that the Government will be dealing directly with.