lag roll

[df54]

 
are lag rolls an offensive or defensive move.

[2bighorn]

 
are lag rolls an offensive or defensive move.

They are performed by the attacker to control closure rate and/or control the angle and prevent defender's reversal. Since they maintain attackers advantage, they may not be purely offensive, but most of the literature is counting them as such.

[Yossarian]

Do you mean a barrel roll?  If so, I use it (poorly) as a defensive manoeuvre.

<S>

Yossarian

[ImADot]

Do you mean a barrel roll?

Lag Roll
    A rolling maneuver, executed from an offensive position, performed opposite the direction of target turn in an attempt to reduce aspect angle and/ or control closure.

Barrel Roll Maneuver
    A vertical rolling maneuver used to reduce aspect angle while keeping sight of the bogey and maintaining nose-tail separation.

These definitions were found at http://www.f-16.net/glossary.html