THIS NSN IS USED TO PURCHASE 60 OR MORE CONTAINERS. TO PURCHASE A MINIMUM OF 1 TO A MAXIMUM OF 19 CONTAINERS USE 3439-01-377-2572. TO PURCHASE A MINIMUM OF 20 TO A MAXIMUM OF 59 CONTAINERS USE 3439-01-407-3250. CERTIFICATION PWA1380A; B50TF56 CLASS B; VFA PM819-56