Despite all the talk of constriction in the credit markets, Wall Street's buyback binge continues.

Earlier this week, we took a look at the logic behind General Dynamics' (NYSE:GD) decision to spend nearly one billion bucks on its own stock. Today, we examine the latest adherent to the "Corporation, buy thyself" philosophy -- fellow government contractor L-3 Communications (NYSE:LLL), which on Tuesday announced that its board has authorized the repurchase of up to $750 million worth of its own shares over the next couple of years.

For the record, L-3 is putting the finishing touches on a half-billion-dollar buyback authorized back in December 2006. With the last few dollars of that effort slated to be spent by year's-end, it's time to refill the till for another round. But with the company having just lost -- finally and definitively this time -- a military translation contract worth up to $4.7 billion, is now really the time to be searching the corporate sofas for buyback funds? And even if L-3 has the necessary cash, should it spend it, or save it for a recession-y day? 

Can it pay?
Not just yet, but perhaps soon. L-3 currently has just $725 million in cash and cash equivalents on its balance sheet, as compared to a whopping $4.5 billion in long-term debt. The good news, though, is that L-3 generated more than $1.1 billion in free cash flow over the last 12 months. If it can keep that free cash flowing, then $750 million in share buybacks over the next 24 months should be entirely doable.

Should it pay?
Absotively. Posilutely. When you compare L-3 to its major rivals in the defense sphere, there's no question that these shares are undervalued.

P/E

Price-to-Free
Cash Flow

Projected
Growth Rate

General Dynamics

20

17

11%

L-3

19

12

17%

Lockheed Martin
(NYSE:LMT)

16

14

12%

Northrop Grumman
(NYSE:NOC)

16

15

13%

Boeing (NYSE:BA)

17

8

16%

I mean, sure, at first glance L-3 has the second-highest P/E in the group. It's second only to General D, which we decided yesterday should under no circumstances be a buyer of its own shares. But look a little closer and what do we find: The second-lowest price-to-free cash flow ratio in the industry and the fastest growth rate of the bunch.

Foolish takeaway
If you ask me, the question isn't whether L-3 should be spending meager savings buying its own shares. It's more a question of: Should L-3 be mortgaging the house, holding a yard sale, and pushing the kids to take paper routes to raise cash to buy more shares?

This is an all-you-can eat moment, folks, and not only should L-3 buy its shares -- you should, too.

Fool contributor Rich Smith does not own shares of any company named above. Not even ultra-cheap Boeing or L-3 (but he's awfully tempted). And if you are in the market for a great deal on a defense stock, first make sure to claim your free trial of Motley Fool Rule Breakers, where we've scoped out three other fast-growing defense plays for you. The Motley Fool has a disclosure policy.